Hvac Service Near Me: Expert A/c Service Guarantees Your Home Remains Cool And Comfortable During Hot Days

Kinds Of AC Repair Work Services

Ever had your air conditioner sputter to a halt just as the summer sun peaks? It's a discouraging circumstance-- one that makes you understand the number of parts should work in consistency for cool air to flow. From frozen coils to refrigerant leaks, the difficulties differ, however the services don't have to be a secret.

Common AC Repair Work Categories

• Refrigerant Recharge and Leakage Repair Work: Without the correct amount of refrigerant, your system has a hard time to cool your area. Identifying leaks is important to restoring performance.
• Compressor and Fan Motor Fixes: These elements are the heart and lungs of your air conditioning. When they stop working, airflow and cooling capability plunge.
• Thermostat Calibration and Replacement: In some cases the perpetrator is your thermostat sending out mixed signals-- adjusting or switching it out brings comfort back on track.
• Electrical Component Repair Work: Faulty circuitry or capacitors interfere with performance, often causing unexpected shutdowns or irregular habits.
• Drain Line Cleaning and Repair Work: Clogged condensate lines can cause water damage and system shutdowns if ignored.

How Bold City Heating and Air Manages These Challenges

Envision walking into your home after a blistering day, welcomed by a sanctuary of cool air. Bold City Heating and Air changes that dream into reality by mastering every element of a/c repair. They don't simply spot leakages or swap parts-- they diagnose the root triggers with surgical precision.

Frozen coils? They thaw the issue and prevent future freeze-ups. Electrical problems? They trace every wire to ensure stability and safety. Thermostat troubles? They tweak settings for perfect climate control. No problem is too twisted, no malfunction too unknown.

What sets Bold City apart is their commitment to thoroughness. Each repair unfolds like a thoroughly choreographed dance, guaranteeing your system runs efficiently, efficiently, and quietly. It's not simply about fixing what's broken; it's about restoring comfort and cool comfort, all while extending the life of your unit.

Unraveling the Mysteries of Air Conditioning Breakdowns

Picture entering your home after a scorching day, only to be greeted by a wave of warm, stagnant air. That sinking feeling? It usually means your air conditioning system is struggling. Amongst the myriad of hiccups, refrigerant leakages frequently play the villain. Not just do they sap the cooling power, but they quietly erode performance, leaving your energy expenses to balloon. Have you ever wondered why your air conditioner cycles on and off so frequently? This phenomenon, referred to as short biking, might be the system's desperate cry for assistance due to dirty filters or malfunctioning thermostat calibration.

Specialist Insights: Decoding the Signs

Bold City Heating and Air acknowledges how annoying it can be when your unit refuses to blow cold air or, worse, floods your home with unanticipated wetness. Their technicians approach each problem with a detective's precision. For example, blocked condensate drains frequently masquerade as minor inconveniences but can result in water damage if disregarded.

Idea Only Pros Share

• Frequently examine and clean your evaporator coil; dust accumulation can reduce cooling effectiveness by as much as 30%.
• Ensure your thermostat is positioned far from direct sunlight or heat-emitting home appliances to avoid incorrect readings.
• Listen for unusual noises like rattling or hissing-- these frequently precede compressor or refrigerant problems.
• Look for ice development on coils; it signals air flow restriction and needs immediate attention.

Common Problems and Their Treatments

Essential Instruments for Detecting Air Conditioner Troubles

Ever tried repairing an air conditioner with just a screwdriver and a prayer? The reality is even more technical. The heart of efficient a/c repair work depend on the precision of the tools wielded. A manifold gauge set, for circumstances, isn't just a fancy device; it's the mechanic's stethoscope, revealing the surprise pressures within the system's veins. Without it, thinking the refrigerant levels resembles reading tea leaves.

Bold City Heating and Air comprehends how important these subtle readings are. They approach each unit with a toolkit that's not simply thorough but carefully calibrated, making sure every twist, turn, and valve modification hits the mark. Their understanding of the nuances in pressure variations and temperature level gradients transforms a job from guesswork to science.

Tools That Transform Repair into Art

• Digital Multimeter: Steps voltage, current, and resistance. Discovers electrical faults that can silently sabotage your AC system.
• Thermometer: Important for determining temperature level differentials throughout coils, suggesting airflow or refrigerant issues.
• Drip Detectors: Utilizing UV color or electronic sensing units, these reveal the invisible leakages that drain pipes efficiency.
• Vacuum Pumps: Leave wetness and air, essential in preparing the system for a flawless recharge.

In my experience, even the smallest neglected information-- like a somewhat worn gasket-- can waterfall into a system-wide inadequacy - Bold City Heating and Air. Bold City's professionals don't just fix; they prepare for the subtle whispers of wear and tear before they scream out as breakdowns

Insider Tips from the Field

1. Constantly double-check manifold gauge readings at different times of the day; ambient temperature shifts can impact accuracy.
2. Use a microamp clamp meter to find faint electrical draws that suggest failing capacitors or motors.
3. When evacuating a system, watch for the "searching" effect in the vacuum gauge, a specialist hint showing trapped moisture.

Tools are only as good as the hands that wield them. Bold City Heating and Air's mastery of their instruments elevates air conditioning repair from a simple service to a finely tuned craft.

Vital Precaution for Air Conditioner Repair

Electrical dangers lurk in every corner of air conditioning system repair, specifically when handling capacitors holding recurring charge. Have you ever questioned why an abrupt shock can shock even experienced professionals? It's because a charged capacitor can keep unsafe energy long after the unit is powered down. That's why Bold City Heating and Air insists on strenuous discharge protocols before touching any parts.

Working around refrigerants demands not just accuracy but likewise alertness. Leakages can silently poison the air or trigger frostbite on contact. When dealing with these undetectable hazards, protective equipment isn't optional-- it's a lifeline. They understand that fumbling without proper gloves and safety glasses belongs to dancing with danger.

For those venturing into DIY repairs, hearken these professional ideas:

• Always cut power at the breaker panel before opening the unit.
• Use a multimeter to confirm no voltage before continuing.
• Wear insulated gloves and eye protection to secure against electric shock and refrigerant direct exposure.
• Manage refrigerant lines with care-- avoid punctures or sharp bends that can cause leaks.
• Keep a fire extinguisher rated for electrical fires nearby.

Picture the scary of an unexpected trigger in a dirty, enclosed space-- fires ignite in the blink of an eye. Bold City Heating and Air's technicians employ precise cleansing routines to get rid of dust accumulation that may otherwise fuel unexpected combustion.

Safety List Before Beginning Repair Work

In the world of a/c repair, rushing through safety checks resembles skipping actions on a high wire-- one mistake can waterfall into catastrophe. Bold City Heating and Air's commitment to these preventative measures changes a dangerous endeavor into a managed, predictable operation. They remain alert, knowing that true mastery in air conditioner repair work is as much about protecting lives as it has to do with restoring comfort.

Cooling Solutions in Jacksonville, FL

Jacksonville, FL is a vibrant city known for its substantial park system, beautiful beaches, and growing arts scene. As the biggest city by location in the continental United States, it provides locals and visitors lots of outdoor activities, consisting of boating along the St - Bold City Heating and Air. Johns River and exploring the Jacksonville Zoo and Gardens. The city's warm environment makes efficient air conditioning essential for comfort and health throughout the year

For those in requirement of cooling services, Bold City Heating and Air offers skilled guidance and totally free consultations to assist ensure your home or organization stays cool and comfortable. Reach out to them for reliable suggestions and options on AC repair work tailored to your needs.

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• San Jose Forest: San Jose Forest is a residential neighborhood located in Jacksonville, Florida, known for its lush greenery and family-friendly atmosphere. The area features a variety of single-family homes and local parks, offering a serene suburban environment.
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1. Cummer Museum of Art and Gardens: The Cummer Museum of Art and Gardens exhibits a broad collection of art encompassing multiple times and cultures. Visitors can also explore lovely formal gardens that look out over the St. Johns River in Jacksonville FL.
2. Jacksonville Zoo and Gardens: Jacksonville Zoo and Gardens showcases a wide collection of creatures and plants from around the world. It provides interesting exhibits, instructive programs, and preservation initiatives for guests of all years. Jacksonville FL
3. Museum of Science and History: The Museum of Science & History in Jacksonville FL features hands-on exhibits and a planetarium suitable for all ages. Guests can explore science, history, and culture through engaging displays and educational programs.
4. Kingsley Plantation: Kingsley Plantation is a historic site that offers a peek into Florida's plantation history, including the lives of enslaved people and the planter family. Visitors can investigate the grounds, such as the slave quarters, plantation house, and barn. Jacksonville FL
5. Fort Caroline National Memorial: Fort Caroline National Memorial honors the 16th-century French endeavor to create a colony in Florida. It offers displays and trails investigating the history and natural environment of the area in Jacksonville FL.
6. Timucuan Ecological and Historic Preserve: Timucuan Ecological and Historic Preserve safeguards one of the last unspoiled coastal marshes on the Atlantic Coast. It maintains the history of the Timucuan Indians, European explorers, and plantation owners.
7. Friendship Fountain: Friendship Fountain is a huge, famous water fountain in Jacksonville FL. It features remarkable water displays and lights, which makes it a favorite site and meeting spot.
8. Riverside Arts Market: Riverside Arts Market in Jacksonville FL, is a lively week-to-week arts and crafts marketplace under the Fuller Warren Bridge. It features regional craftspeople, live music, food sellers, and a beautiful view of the St. Johns River.
9. San Marco Square: San Marco Square is a lovely shopping and eating area with a European-inspired ambiance. It is famous for its exclusive shops, restaurants, and the iconic fountain featuring lions. Jacksonville FL
10. St Johns Town Center: St. Johns Town Center is an upscale open-air retail center in Jacksonville FL, offering a blend of luxury stores, well-known brands, and restaurants. It's a premier destination for purchasing, eating, and recreation in Northeast FL.
11. Avondale Historic District: Avondale Historic District showcases delightful early 20th-century architecture and specialty shops. It's a lively neighborhood recognized for its local restaurants and historical character. Jacksonville FL
12. Treaty Oak Park: Treaty Oak Park is a lovely green space in Jacksonville FL, home to a huge, centuries-old oak tree. The park offers a tranquil retreat with trails and picturesque views of the St. Johns River.
13. Little Talbot Island State Park: Little Talbot Island State Park in Jacksonville FL offers untouched shores and varied habitats. Guests can experience activities such as hiking, camping, and wildlife viewing in this unspoiled coastal setting.
14. Big Talbot Island State Park: Big Talbot Island State Park in Jacksonville FL, offers breathtaking coastal views and varied ecosystems for nature enthusiasts. Discover the unique boneyard beach, hike scenic trails, and watch abundant wildlife in this beautiful natural preserve.
15. Kathryn Abbey Hanna Park: Kathryn Abbey Hanna Park in Jacksonville FL, provides a stunning beach, wooded trails, and a 60-acre fresh water lake for recreation. It is a popular spot for camping, surfing, kayaking, and biking.
16. Jacksonville Arboretum and Gardens: Jacksonville Arboretum & Gardens provides a lovely ecological escape with diverse paths and themed gardens. Visitors can discover a variety of plant life and relish serene outdoor recreation.
17. Memorial Park: Memorial Park is a 5.25-acre area that acts as a homage to the over 1,200 Floridians who gave their lives in World War I. The park features a sculpture, reflecting pool, and gardens, providing a place for memory and reflection. Jacksonville FL
18. Hemming Park: Hemming Park is Jacksonville FL's most ancient park, a historical open square holding events, markets, and social get-togethers. It offers a green space in the center of downtown with art installations and a lively ambiance.
19. Metropolitan Park: Metropolitan Park in Jacksonville FL provides a beautiful riverfront location for events and recreation. Featuring play areas, a concert venue, and picturesque views, it is a well-known destination for residents and visitors as well.
20. Confederate Park: Confederate Park in Jacksonville FL, was originally designated to honor rebel soldiers and sailors. It has since been redesignated and repurposed as a space for local events and recreation.
21. Beaches Museum and History Park: Beaches Museum & History Park protects and relays the distinct history of Jacksonville's beaches. Investigate exhibits on community life-saving, surfing, and initial beach communities.
22. Atlantic Beach: Atlantic Beach features a charming seaside area with stunning beaches and a peaceful atmosphere. Guests can experience surfing, swimming, and investigating local shops and restaurants near Jacksonville FL.
23. Neptune Beach: The city of Neptune Beach gives a traditional Florida beach town feeling with its grainy beaches and laid-back vibe. Visitors can experience surfing, swimming, and discovering nearby shops and restaurants in Jacksonville FL.
24. Jacksonville Beach: Jacksonville Beach is a vibrant coastal city known because of its grainy shores and surf scene. It offers a blend of leisure activities, dining, and nightlife beside the Atlantic Ocean.
25. Huguenot Memorial Park: Huguenot Memorial Park provides a lovely beachfront spot with options for camping, fishing, and birdwatching. Visitors can appreciate the natural beauty of the area with its diverse wildlife and scenic coastal views in Jacksonville FL.
26. Castaway Island Preserve: Castaway Island Preserve in Jacksonville FL, provides scenic trails and walkways through varied ecosystems. Visitors can relish walks in nature, birdwatching, and discovering the splendor of the shoreline area.
27. Yellow Bluff Fort Historic State Park: Yellow Bluff Fort Historic State Park in Jacksonville FL preserves the earthen remnants of a Civil War-era Southern fort. Guests can discover the historic site and discover regarding its meaning through informative exhibits.
28. Mandarin Museum & Historical Society: The Mandarin Museum & Historical Society protects the history of the Mandarin neighborhood within Jacksonville FL. Guests are able to discover exhibits and artifacts that display the location's unique history.
29. Museum of Southern History: This Museum of Southern History displays artifacts and exhibits connected to the history and culture of the Southern United States. Guests are able to delve into a range of topics, such as the Civil War, slavery, and Southern art and literature. Jacksonville FL
30. The Catty Shack Ranch Wildlife Sanctuary: The Catty Shack Ranch Wildlife Sanctuary in Jacksonville FL, provides escorted foot tours to see rescued big cats and other exotic animals. It's a not-for-profit organization dedicated to offering a secure, loving, forever home for these animals.

1. Air Conditioning Installation: Right placement of cooling systems ensures effective and comfortable indoor climates. This critical process ensures peak performance and longevity of climate control units.
2. Air Conditioner: Air Conditioners chill inside spaces by extracting heat and moisture. Proper installation by certified technicians guarantees effective performance and ideal climate control.
3. Hvac: Hvac systems adjust heat and air quality. They are crucial for establishing climate control solutions in buildings.
4. Thermostat: The Thermostat is the primary component for regulating temperature in climate control systems. It tells the cooling unit to activate and deactivate, maintaining the desired indoor environment.
5. Refrigerant: Refrigerant is crucial for cooling systems, absorbing heat to generate cool air. Proper handling of refrigerants is vital during HVAC installation for efficient and secure operation.
6. Compressor: The Compressor is a vital component of your cooling system, pressurizing refrigerant. This process is critical for effective temperature control in climate control systems.
7. Evaporator Coil: An Evaporator Coil takes in heat from indoor air, cooling it down. This part is essential for effective climate control system setup in buildings.
8. Condenser Coil: This Condenser Coil serves as an integral component in cooling systems, releasing heat outside. It facilitates the heat exchange needed for effective indoor climate management.
9. Ductwork: Ductwork is essential for dispersing treated air all through a building. Suitable duct layout and installation are vital for effective climate regulation system location.
10. Ventilation: Effective Ventilation is essential for adequate airflow and indoor air quality. It has a vital role in ensuring maximum operation and effectiveness of climate control equipment.
11. Heat Pump: Heat Pumps transfer heat, providing both heating and cooling. They're essential components in contemporary climate control system setups, offering energy-efficient temperature regulation.
12. Split System: Split System provide both cooling and heating via an indoor unit connected to an outdoor compressor. They offer a ductless answer for temperature regulation in certain rooms or areas.
13. Central Air Conditioning: Central air conditioning systems cool whole homes from a sole, powerful unit. Correct setup of these systems is crucial for streamlined and functional home cooling.
14. Energy Efficiency Ratio: Energy Efficiency Ratio measures cooling efficiency: higher Energy Efficiency Ratio indicates better performance and lower energy consumption for climate control systems. Choosing a unit with a high Energy Efficiency Ratio can significantly lower long-term costs when installing a new climate control system.
15. Variable Speed Compressor: Variable Speed Compressors change refrigeration production to meet demand, boosting efficiency and convenience in HVAC systems. This precise modulation lowers energy waste and preserves uniform temperatures in indoor environments.
16. Compressor Maintenance: Maintaining compressors ensures effective performance and longevity in refrigeration systems. Neglecting it can lead to costly repairs or system failures when establishing climate control.
17. Air Filter: Air Filter capture dirt and debris, ensuring clean airflow within HVAC systems. This improves system performance and indoor air condition throughout climate control process.
18. Installation Manual: An Installation Manual offers crucial guidance for properly setting up a cooling system. It ensures correct steps are followed for optimal performance and safety during the unit's setup.
19. Electrical Wiring: Electrical Wiring is critical for supplying power to and regulating the parts of climate control systems. Proper wiring ensures safe and effective functioning of the cooling and heating units.
20. Indoor Unit: Indoor Unit moves treated air inside a space. It's a critical part for climate control systems, ensuring correct temp control in buildings.
21. Outdoor Unit: This Outdoor Unit contains the compressor and condenser, dissipating heat externally. It's essential for a full climate control system installation, guaranteeing efficient cooling inside.
22. Maintenance: Regular upkeep ensures efficient performance and lengthens the lifespan of climate control systems. Proper Maintenance averts failures and optimizes the performance of installed cooling systems.
23. Energy Efficiency: Energy Efficiency is crucial for lowering energy consumption and costs when establishing new climate control systems. Prioritizing efficient equipment and proper setup reduces environmental impact and maximizes long-term savings.
24. Thermodynamics: Thermodynamics explains how heat moves and converts energy, vital for cooling setup system. Efficient climate control creation relies on Thermodynamics principles to maximize energy use during setup placement.
25. Building Codes: Construction regulations assure suitable and safe HVAC system setup in structures. They govern aspects like energy efficiency and air flow for climate control systems.
26. Load Calculation: Load calculations determines the warming and cooling demands of a room. This is crucial for choosing appropriately dimensioned HVAC equipment for optimal climate control.
27. Mini Split: Mini Splits offer a no-duct approach to temperature management, offering focused heating and cooling. The simple installation makes them appropriate for spaces where adding ductwork for climate modification is unfeasible.
28. Air Handler: The Air Handler moves treated air around a building. It's a crucial component for correct climate control system installation.
29. Insulation: Thermal protection is essential for preserving effective temperature regulation within a building. It minimizes heat exchange, reducing the workload on cooling systems and optimizing temperature setups.
30. Drainage System: Drainage systems eliminate condensate generated by cooling equipment. Adequate drainage stops water damage and guarantees optimal operation of air conditioning setups.
31. Filter: Filters are vital components that eliminate contaminants from the air throughout the setup of climate control systems. This ensures purer air circulation and safeguards the system's inner components.
32. Heating Ventilation And Air Conditioning: Heating Ventilation And Air Conditioning systems regulate indoor environment by regulating temperature, humidity, and air condition. Proper installation of these systems ensures efficient and effective cooling and environmental control inside buildings.
33. Split System Air Conditioner: Split system air conditioners provide efficient cooling and heating by separating the compressor and condenser from the air handler. Their design eases the procedure of establishing climate control in homes and businesses.
34. Hvac Technician: Hvac Technicians are skilled professionals who specialize in the setup of temperature regulation systems. They ensure proper operation and efficiency of these systems for maximum indoor comfort.
35. Indoor Air Quality: Indoor Air Quality greatly impacts comfort and health, so HVAC system setup should prioritize filtration and ventilation. Correct system planning and installation is essential for improving air quality.
36. Condensate Drain: The Condensate Drain eliminates water generated during the cooling operation, stopping damage and keeping system effectiveness. Correct drain assembly is crucial for effective climate control installation and long-term performance.
37. Variable Refrigerant Flow: Variable Refrigerant Flow (VRF) systems precisely control refrigerant amount to various zones, offering customized cooling and heating. The technology is essential for establishing effective and adaptable climate control in building environments.
38. Building Automation System: Building automation systems orchestrate and streamline the functioning of HVAC equipment. This results in enhanced climate control and energy efficiency in buildings.
39. Air Conditioning: Heating, ventilation, and air conditioning systems control indoor temperature and atmosphere. Proper configuration of these systems is key for optimized and effective climate control.
40. Temperature Control: Accurate temperature regulation is essential for efficient climate control system installation. It guarantees optimal performance and comfort in newly installed cooling systems.
41. Thermistor: Thermistors are temperature-sensitive resistors used in climate control systems to accurately measure air temperature. This data helps to control system performance, ensuring peak performance and energy efficiency in environmental control arrangements.
42. Thermocouple: Thermocouples are temperature sensors vital for guaranteeing proper HVAC system setup. They accurately gauge temperature, allowing precise adjustments and optimal climate control function.
43. Digital Thermostat: Digital Thermostats precisely regulate temperature, optimizing HVAC system operation. They are essential for setting up home climate regulation systems, ensuring efficient and pleasant environments.
44. Programmable Thermostat: Programmable Thermostats improve HVAC systems by enabling customized temperature routines. This leads to improved energy efficiency and comfort in residential AC setups.
45. Smart Thermostat: Smart thermostat streamline home temperature management by learning user preferences and adjusting temperatures on their own. They play a vital role in modern HVAC system configurations, enhancing energy savings and convenience.
46. Bimetallic Strip: A bimetallic strip, made up of two metals with different expansion rates, curves in reaction to temperature changes. This property is used in HVAC systems to operate thermostats and regulate heating or cooling operations.
47. Capillary Tube Thermostat: The Capillary Tube Thermostat precisely controls temperature in cooling systems via remote sensing. This component is vital for keeping desired climate control within buildings.
48. Thermostatic Expansion Valve: The Thermostatic Expansion Valve regulates refrigerant stream into the evaporator, keeping best cooling. This part is crucial for efficient operation of refrigeration and air conditioning systems in buildings.
49. Setpoint: Setpoint is the target temperature a climate management system aims to achieve. It guides the system's performance during climate management setups to preserve desired comfort degrees.
50. Temperature Sensor: Temperature sensing devices are essential for adjusting warming, air flow, and air conditioning systems by monitoring air temperature and guaranteeing optimal climate control. Their data aids optimize system performance during climate control installation and maintenance.
51. Feedback Loop: The Feedback Loop assists with controlling temperature during climate control system setup by continuously monitoring and adjusting settings. This ensures peak performance and energy efficiency of installed residential cooling.
52. Control System: Control Systems regulate heat, humidity, and air circulation in environmental conditioning setups. These systems ensure optimal well-being and energy savings in temperature-controlled environments.
53. Thermal Equilibrium: Thermal Equilibrium is reached when components attain the same temperature, essential for effective climate control system installation. Proper balance assures maximum performance and energy savings in placed cooling systems.
54. Thermal Conductivity: Thermal Conductivity dictates how efficiently materials conduct heat, impacting the cooling system setup. Choosing materials with appropriate thermal properties assures best performance of installed climate control systems.
55. Thermal Insulation: Thermal Insulation minimizes heat flow, ensuring efficient cooling by reducing the workload on climate control systems. This boosts energy efficiency and keeps consistent temperatures in buildings.
56. On Off Control: On-Off Control maintains wanted temperatures by fully turning on or deactivating cooling systems. This simple way is crucial for regulating temperature within buildings during environmental control system installation.
57. Pid Controller: PID Controllers accurately regulate temperature in HVAC units. This makes sure effective climate control during facility climate configuration and operation.
58. Evaporator: This Evaporator absorbs heat from inside a space, chilling the air. It's a key component in climate control systems created for indoor comfort.
59. Condenser: The Condenser unit is a essential part in cooling systems, transferring heat extracted from the indoor space to the outside environment. Its correct installation is crucial for effective climate control system placement and performance.
60. Chlorofluorocarbon: Chlorofluorocarbons were previously widely used refrigerants that facilitated cooling in numerous building systems. Their part has diminished due to environmental concerns about ozone depletion.
61. Hydrofluorocarbon: Hydrofluorocarbon are coolants commonly used in cooling systems for structures and vehicles. Their suitable treatment is vital during the installation of climate control systems to avoid environmental damage and assure effective operation.
62. Hydrochlorofluorocarbon: HCFCs were once widely used refrigerants in air conditioning systems for buildings. Their phase-out has caused the adoption of more eco-friendly options for new HVAC installations.
63. Global Warming Potential: Global Warming Potential (GWP) shows how much a given mass of greenhouse gas adds to global warming over a set period compared to carbon dioxide. Selecting refrigerants with less GWP is key when building climate control systems to minimize environmental effects.
64. Ozone Depletion: Ozone Depletion from refrigerants poses environmental dangers. Technicians servicing cooling units must adhere to regulations to prevent further damage.
65. Phase Change: Phase Changes of refrigerants are crucial for effectively moving heat in climate control systems. Evaporation and condensation processes enable cooling by taking in heat indoors and releasing it outdoors.
66. Heat Transfer: Heat Transfer principles are key for efficient climate control system installation. Knowing conduction, convection, and radiation ensures prime system functioning and energy efficiency during the course of installing home cooling.
67. Refrigeration Cycle: The Refrigeration Cycle transfers heat, enabling cooling in climate-control systems. Proper installation and upkeep ensure efficient performance and long life of these cooling solutions.
68. Environmental Protection Agency: EPA controls refrigerants and establishes standards for HVAC system maintenance to protect the ozone layer and lower greenhouse gas emissions. Technicians working with refrigeration equipment must be certified to ensure correct refrigerant management and prevent environmental damage.
69. Leak Detection: Leak Detection makes certain the integrity of refrigerant lines after climate control system installation. Spotting and fixing leaks is vital for peak performance and ecological safety of newly installed climate control systems.
70. Pressure Gauge: Pressure gauges are critical tools for monitoring refrigerant levels during HVAC system setup. They assure peak performance and prevent damage by verifying pressures are within certain ranges for proper cooling operation.
71. Expansion Valve: This Expansion Valve modulates refrigerant flow in cooling systems, enabling efficient heat uptake. It is a vital component for maximum performance in environmental control setups.
72. Cooling Capacity: Cooling Capacity determines how well a system can lower the temperature of a room. Selecting the correct level is essential for optimal performance in placement of environmental control systems.
73. Refrigerant Recovery: Refrigerant Recovery is the method of taking out and storing refrigerants during HVAC system installations. Properly recovering refrigerants prevents environmental harm and guarantees effective new cooling equipment placements.
74. Refrigerant Recycling: Refrigerant Recycling recovers and recycles refrigerants, lessening environmental effects. This procedure is vital when setting up climate control systems, guaranteeing responsible handling and preventing ozone depletion.
75. Safety Data Sheet: Safety Data Sheets (SDS) supply critical information on the secure handling and possible hazards of chemicals utilized in cooling system installation. Technicians use SDS data to defend themselves and avoid accidents during HVAC equipment placement and connection.
76. Synthetic Refrigerant: Synthetic Refrigerants are vital liquids utilized in refrigeration systems to move heat. Their proper management is crucial for effective climate control setup and maintenance.
77. Heat Exchange: Heat Exchange is vital for chilling buildings, enabling effective temperature control. It's a key process in climate control system setup, facilitating the transfer of heat to provide comfortable indoor spaces.
78. Cooling Cycle: The Cooling Cycle is the basic process of heat extraction, utilizing refrigerant to take in and give off heat. This process is critical for efficient climate control system installation in buildings.
79. Scroll Compressor: Scroll compressors effectively compress refrigerant to power cooling systems. They are a vital component for efficient temperature regulation in buildings.
80. Reciprocating Compressor: Reciprocating pumps are crucial parts that squeeze refrigerant in refrigeration systems. They aid heat exchange, enabling efficient climate regulation within structures.
81. Centrifugal Compressor: Centrifugal Compressors are vital parts that boost refrigerant stress in wide climate control systems. They effectively circulate refrigerant, allowing effective cooling and heating throughout wide areas.
82. Rotary Compressor: Rotary Compressor represent a vital component in refrigeration systems, using a rotating mechanism to compress refrigerant. Their efficiency and reduced size render them perfect for climate control setups in various applications.
83. Compressor Motor: This Compressor Motor serves as the main force for the refrigeration process, moving refrigerant. It is essential for proper climate control system installation and function in buildings.
84. Compressor Oil: Compressor Oil lubricates and seals mechanical parts inside a systems' compressor, ensuring effective refrigerant pressurization for suitable climate control. It is important to select the correct type of oil throughout system setup to ensure durability and peak performance of the refrigeration unit.
85. Pressure Switch: A Pressure Switch observes refrigerant amounts, guaranteeing the system works safely. It stops damage by shutting down the cooling apparatus if pressure falls beyond the acceptable range.
86. Compressor Relay: The Compressor Relay is an electrical switch that controls the compressor motor in cooling setups. It ensures the compressor begins and ceases properly, allowing effective temperature regulation within climate control systems.
87. Suction Line: The Suction Line, a essential part in cooling systems, moves refrigerant vapor from the evaporator back the compressor. Appropriate sizing and insulation of the line are essential for efficient system performance during climate control installation.
88. Discharge Line: The discharge line carries hot, high-pressure refrigerant gas from the compressor to the condenser. Proper sizing and setup of this Discharge Line are critical for ideal cooling system setup.
89. Compressor Capacity: Compressor Capacity dictates the cooling capability of a system for indoor climate control. Choosing the right size ensures efficient temperature regulation during climate control installation.
90. Cooling Load: Cooling Load is the quantity of heat that must to be removed from a area to maintain a desired temperature. Correct cooling load calculation is important for proper HVAC system installation and sizing.
91. Air Conditioning Repair: Air Conditioning Repair ensures systems operate optimally after they are setup. It's crucial for keeping effective climate control systems put in place.
92. Refrigerant Leak: Refrigerant Leaks decrease cooling effectiveness and can cause equipment malfunction. Addressing these leakages is essential for correct climate control system setup, assuring maximum operation and longevity.
93. Seer Rating: SEER rating indicates an HVAC system's cooling efficiency, impacting long-term energy expenses. Elevated SEER values mean greater energy conservation when setting up climate control.
94. Hspf Rating: HSPF rating demonstrates the heating effectiveness of heat pumps. Higher ratings indicate better energy efficiency during climate control installation.
95. Preventative Maintenance: Preventative Maintenance makes sure HVAC systems work efficiently and dependably after setup. Routine upkeep lessens failures and lengthens the lifespan of HVAC systems.
96. Airflow: Airflow guarantees effective cooling and heating distribution throughout a building. Suitable Airflow is essential for optimal performance and comfort in climate control systems.
97. Electrical Components: Electrical Components are critical for powering and controlling systems that govern indoor temperature. They guarantee correct performance, safety, and effectiveness in temperature regulation setups.
98. Refrigerant Charging: Refrigerant Charging is the procedure of adding the proper quantity of refrigerant to a cooling system. This guarantees peak performance and effectiveness when setting up climate control units.
99. System Diagnosis: System Diagnosis pinpoints potential problems prior to, while, and following HVAC system installation. It ensures optimal operation and prevents upcoming problems in climate control systems.
100. Hvac System: HVAC systems regulate heat, humidity, and air quality in structures. They are essential for creating climate control solutions in residential and business areas.
101. Ductless Air Conditioning: Ductless Air Conditioning provide targeted temperature control without extensive ductwork. They simplify climate control installation in spaces lacking pre-existing duct systems.
102. Window Air Conditioner: Window air conditioners are self-contained units placed in windows to chill individual spaces. They provide a straightforward way for localized temperature regulation inside a structure.
103. Portable Air Conditioner: Portable AC units provide a adaptable cooling answer for spaces lacking central systems. They can also provide short-term climate control during HVAC system installations.
104. System Inspection: System Inspection ensures correct installation of cooling systems by verifying component condition and adherence to installation standards. This procedure ensures effective operation and prevents future malfunctions in climate control setups.
105. Coil Cleaning: Coil Cleaning ensures efficient heat transfer, crucial for peak system performance. This maintenance procedure is vital for proper installation of climate control systems.
106. Refrigerant Recharge: Refrigerant Recharge is essential for recovering chilling capacity in cooling systems. It assures maximum operation and longevity of brand new climate control equipment.
107. Capacitor: Capacitors provide the needed energy increase to start and run motors within climate control systems. Their proper function ensures effective and dependable operation of the cooling unit.
108. Contactor: The Contactor serves as an electrical switch that controls power to the outdoor unit's components. It allows the cooling system to turn on when needed.
109. Blower Motor: This Blower Motor circulates air through the ductwork, allowing for efficient heating and cooling distribution within a building. It's a crucial component for indoor climate control systems, assuring stable temperature and airflow.
110. Overheating: Overheating can severely hamper the performance of newly set-up climate control systems. Technicians must fix this issue to ensure effective and reliable cooling operation.
111. Troubleshooting: Troubleshooting identifies and resolves problems that occur during climate control system setup. Effective fixing ensures optimal system performance and stops future problems during building cooling appliance installation.
112. Refrigerant Reclaiming: Refrigerant Reclaiming retrieves and reclaims spent refrigerants. This procedure is essential for eco-friendly HVAC system setup.
113. Global Warming: Global Warming increases the demand or for cooling systems, requiring demanding more frequent setups installations. This heightened increased need drives fuels innovation in energy-efficient power-saving climate control solutions options.
114. Montreal Protocol: This Montreal Protocol phases out ozone-depleting materials utilized in cooling systems. This shift requires utilizing alternative refrigerants in new environmental control setups.
115. Greenhouse Gas: Greenhouse Gas trap warmth, impacting the power efficiency and environmental footprint of climate control system configurations. Selecting refrigerants with lower global warming potential is essential for sustainable weather control implementation.
116. Cfc: CFCs were formerly essential refrigerants in cooling systems for structures and vehicles. Their use has been discontinued due to their damaging impact on the ozone layer.
117. Hcfc: Hcfc were once typical refrigerants used in refrigeration systems for structures and vehicles. They facilitated the process of establishing climate control systems, but are now being phased out due to their ozone-depleting properties.
118. Hfc: HFCs are commonly used refrigerants in cooling systems for buildings. Their correct handling is essential during the establishment of these systems to reduce environmental impact.
119. Refrigerant Oil: Cooling lubricant lubricates the compressor in refrigeration units, ensuring smooth performance and longevity. It's essential for the correct operation of cooling setups.
120. Phase-Out: Phase-Out is about the gradual reduction of specific refrigerants with elevated global warming capacity. This affects the choice and servicing of climate control systems in buildings.
121. Gwp: GWP indicates a refrigerant's ability to heat the planet if discharged. Lower GWP refrigerants are progressively favored in eco-friendly HVAC system configurations.
122. Odp: ODP refrigerants damage the ozone layer, influencing regulations for cooling system setup. Installers must utilize ozone-friendly alternatives during climate control equipment placement.
123. Ashrae: ASHRAE sets standards and guidelines for HVAC systems configuration. The standards assure efficient and secure climate control systems implementation in buildings.
124. Hvac Systems: Hvac Systems provide temperature and air quality regulation for indoor environments. They are critical for establishing cooling systems in buildings.
125. Refrigerant Leaks: Refrigerant Leaks lessen cooling system efficiency and may harm the environment. Appropriate procedures during climate control unit installation are crucial to avoid these leaks and guarantee best performance.
126. Hvac Repair Costs: Hvac Repair Costs can significantly affect decisions about switching to a new climate control system. Unexpected repair costs may prompt homeowners to put money in a complete home comfort setup for long-term savings.
127. Hvac Installation: Hvac Installation involves installing warming, air flow, and cooling units. It's critical for allowing effective climate control within structures.
128. Hvac Maintenance: Hvac Maintenance ensures efficient operation and prolongs system lifespan. Appropriate upkeep is vital for seamless climate control system setups.
129. Hvac Troubleshooting: Hvac Troubleshooting pinpoints and resolves problems in heating, ventilation, and cooling systems. It guarantees optimal operation during climate control unit setup and operation.
130. Zoning Systems: Zoning Systems split a building into separate areas for personalized temperature control. This method optimizes well-being and energy savings during HVAC configuration.
131. Compressor Types: Various Compressor Types are vital components for efficient climate control systems. Their selection significantly impacts system efficiency and performance in environmental comfort uses.
132. Compressor Efficiency: Compressor Efficiency is vital, dictating how efficiently the system cools a space for a given energy input. Improving this efficiency directly impacts cooling system setup costs and long-term operational expenses.
133. Compressor Overheating: Compressor Overheating can severely damage the device's heart, leading to system failure. Proper setup ensures sufficient airflow and refrigerant levels, preventing this problem in climate control system installations.
134. Compressor Failure: Compressor Failure halts the refrigeration process, requiring expert service during climate control system configurations. A defective compressor compromises the entire system's efficiency and lifespan when incorporating it into a building.
135. Overload Protector: An Overload Protector protects the compressor motor from overheating during climate control system installation. It stops damage by automatically shutting off power when too much current or temperature is detected.
136. Fan Motor: Fan Motor circulate air across evaporator and condenser coils, a critical process for efficient climate control system installation. They aid heat transfer, guaranteeing peak cooling and heating performance within the specified space.
137. Refrigerant Lines: Refrigerant Lines are essential components that join the indoor and outside units, circulating refrigerant to facilitate cooling. Their proper proper installation is essential for streamlined and effective climate control system setup.
138. Condensing Unit: The Condensing Unit is the outdoor component in a cooling system. The unit removes heat from the refrigerant, enabling indoor temperature control.
139. Heat Rejection: Heat Rejection is essential for refrigeration systems to effectively remove excess heat from a conditioned space. Appropriate Heat Rejection guarantees optimal performance and lifespan of climate control setups.
140. System Efficiency: System Efficiency is essential for reducing energy consumption and operational costs. Optimizing performance during climate control setup ensures long-term economy and environmental advantages.
141. Pressure Drop: Pressure Drop is the reduction in fluid pressure as it flows through a system, impacting airflow in climate control setups. Properly controlling pressure decrease is essential for optimal performance and efficiency in environmental comfort systems.
142. Subcooling: Subcooling process guarantees best system performance by chilling the refrigerant below its condensing temperature. This action stops flash gas, maximizing refrigeration capacity and efficiency during HVAC equipment installation.
143. Superheat: Superheat ensures that just vapor refrigerant goes into the compressor, which prevents damage. It's crucial to measure superheat during HVAC system installation to optimize cooling performance and efficiency.
144. Refrigerant Charge: Refrigerant Charge is the quantity of refrigerant in a system, vital for best cooling performance. Proper charging ensures effective heat exchange and prevents damage during climate control setup.
145. Corrosion: Corrosion impairs metallic elements, possibly causing leakage and system malfunctions. Protecting against Corrosion is essential for keeping the effectiveness and lifespan of climate control setups.
146. Fins: Blades increase the surface area of coils, increasing heat transfer efficiency. This is essential for best performance in environmental control system configurations.
147. Copper Tubing: Copper piping is essential for refrigerant transfer in HVAC systems because of its durability and effective heat transfer. Its trustworthy connections assure suitable system operation during installation of temperature regulation units.
148. Aluminum Tubing: Aluminum Tubing is essential for transporting refrigerant in HVAC systems. Its light and corrosion-resistant properties render them ideal for connecting internal and external units in HVAC installations.
149. Repair Costs: Sudden maintenance can greatly impact the overall expense of setting up a new climate control system. Budgeting for potential Repair Costs ensures a more accurate and comprehensive cost assessment when implementing such a system.

Bold City Heating & Air

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8400 Baymeadows Way Suite 1, Jacksonville, FL 32256, United States

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boldcityac.com

boldcityac.com

+1 904-379-1648

6C9C+2H Baymeadows Center, Jacksonville, FL, USA

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That Florida sun? It doesn’t play. Prepping your HVAC system now means cool breezes later. Clean filters ✔️ Check refrigerant ✔️ Program thermostats ✔️ 🔥 Be heatwave-ready with Bold City Heating & Air! Book your seasonal check-up and beat the summer rush!

3 days ago

Updates from customers

Randolph and the crew were so nice and they did a AWESOME Job of putting in new ductwork & installation. Great group of guys. RT would answer any questions you had. Felt comfortable with them in my home. From the girl at the front desk to everyone involved Thank You!! I Appreciate you all. I definitely would recommend this company to anyone 😊

a year ago

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Why would an AC heater not be turning on?

An AC heater may not turn on due to power issues like tripped circuit breakers, blown fuses, or loose wiring, thermostat problems such as dead batteries, incorrect settings, or a faulty unit, or safety features engaging due to clogged filte …

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4.9

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"Best price and service I have ever had with an HVAC partner"

"Excellent workmanship, knowledgeable, friendly staff from owner to employees."

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Abe Fernandez

11 reviews · 11 photos

a week ago

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DO NOT HIRE THIS COMPANY. TOOK THEM TO COURT AND WON!

We hired Bold City Heating and Air to replace all our air ducts, and the work they performed was shockingly defective. After the job was done we noticed that … More

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Kenneth Jefferson

5 reviews · 3 photos

2 months ago

Jacob; Ben & Josie were very professional and efficient. If I could give 10 stars I would. Very knowledgeable and they kept me informed throughout the whole process of my complete AC installation. The entire process was easy with Bold City … More

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Response from the owner 2 months ago

Thank you so much for your fantastic 5-star review, Kenneth & Monique! We're thrilled to hear that Jacob, Ben, and Josie provided you with professional and efficient service during your complete AC installation. At Bold City Heating & Air, … More

WILLIAM MOSIER

2 reviews · 4 photos

a month ago

Crew showed up on time got done earlier than expected. Everything was clean. They were quiet. I was able to work throughout the day while they were installing. Couldn’t have been more perfect. Happy with the service.

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Response from the owner a month ago

Thank you so much for your fantastic 5-star review, William! We're thrilled to hear that our team at Bold City Heating & Air made the installation process seamless and respectful of your work day. We appreciate your support and are glad you’re happy with our service! Let us know if you need anything else in the future!

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Bold City Heating & Air

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Bold City offers premium HVAC service and competitive pricing to the Jacksonville, Jacksonville Beaches and Ponte Vedra areas.

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At Bold City Heating & Air, we offer our customers exceptional service when it comes to HVAC in Jacksonville, FL.

From heating and cooling repairs to energy-efficient HVAC installations that save you money, we do it all. When we opened our family-owned business in 2016, we knew we wanted to be the best around and that’s a passion that still stands.

From the moment you call us to the moment we carry out our work, you can depend on us. We believe in clear upfront pricing, no hidden costs, and the highest level of workmanship. With our NATE-certified technicians and Energy Star systems we give you the perfect combination of choice, value, and customer care.
“Experience the Bold Difference” that is Bold City Heating & Air by calling us today!

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When it comes to heating and air services in Jacksonville, we offer all the services you need under one roof. But that’s not where our story ends.

From your HVAC system to your ducts and indoor air quality we offer a complete end-to-end solution. Our team is at the heart of everything we do. Our continuous program of education and training ensures our technicians are the best they can be. It also means our entire team stays up to date with the latest systems and technology. From our Energy Star systems to our whole-house approach, you can depend on every service and product we have to offer.

Our educated and experienced HVAC technicians specialize in a broad range of air conditioning, heating & indoor air quality solutions. We are dedicated to finding the right fit for your home or business. Our broad range of expertise ensures a solution to every challenge.

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Prioritizing satisfaction, Bold City Heating & Air exemplifies customer service.

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Keeping you comfortable is our top priority!

When you need an HVAC contractor backed by generations of experience and who truly cares about your satisfaction, turn to Bold City Heating & Air. From air conditioning repairs to the installation of a new energy-efficient heating system, you can depend on our team. We’ll get to you as quickly as we can to solve any problem you might be experiencing.

If you need help with HVAC installation or replacement, we’ll recommend the perfect system and provide you with a competitive quote. We’ll help you to save money on your energy costs going forward and can even help with financing on approved credit.

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Recently moved here from MD and was not familiar with the heating/AC unit. Bold City, especially Sam Powel, has been VERY helpful. In our short time here in FL, we have recommended Bold City to acquaintances numerous times, and will continue to do so.

Paul G.

Another excellent job by Bold City. Bryan was on time, thorough, explained his analysis and solution, and completed the job. He demonstrated knowledge and expertise while providing a high level of customer service. Well done!!

John L.

Recently moved here from MD and was not familiar with the heating/AC unit. Bold City, especially Sam Powel, has been VERY helpful. In our short time here in FL, we have recommended Bold City to acquaintances numerous times, and will continue to do so.

Paul G.

Another excellent job by Bold City. Bryan was on time, thorough, explained his analysis and solution, and completed the job. He demonstrated knowledge and expertise while providing a high level of customer service. Well done!!

John L.

Recently moved here from MD and was not familiar with the heating/AC unit. Bold City, especially Sam Powel, has been VERY helpful. In our short time here in FL, we have recommended Bold City to acquaintances numerous times, and will continue to do so.

Paul G.

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When you’re looking for an HVAC company that you can count on, look no further than Bold City Heating & Air.

Why not try out our award-winning service for yourself? We promise to never give you the upsell. Our technicians don’t get paid commission and we don’t focus on profit margins. We know that if we give our customers the best service, our profits will look after themselves. Whether you’re looking for heating and cooling repairs in Jacksonville or you need HVAC installation or maintenance, speak to our friendly family-owned team.

We’re proud to offer our high quality HVAC services to the residents of Jacksonville. Contact our team at Bold City Heating & Air today and experience our great service for yourself!

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Air conditioning

From Wikipedia, the free encyclopedia

This article is about cooling of air. For the Curved Air album, see Air Conditioning (album). For a similar device capable of both cooling and heating, see Heat pump.

"a/c" redirects here. For the abbreviation used in banking and book-keeping, see Account (disambiguation). For other uses, see AC.

There are various types of air conditioners. Popular examples include: Window-mounted air conditioner (China, 2023); Ceiling-mounted cassette air conditioner (China, 2023); Wall-mounted air conditioner (Japan, 2020); Ceiling-mounted console (Also called ceiling suspended) air conditioner (China, 2023); and portable air conditioner (Vatican City, 2018).

Air conditioning, often abbreviated as A/C (US) or air con (UK),^[1] is the process of removing heat from an enclosed space to achieve a more comfortable interior temperature and in some cases also controlling the humidity of internal air. Air conditioning can be achieved using a mechanical 'air conditioner' or through other methods, including passive cooling and ventilative cooling.^[2][3] Air conditioning is a member of a family of systems and techniques that provide heating, ventilation, and air conditioning (HVAC).^[4] Heat pumps are similar in many ways to air conditioners but use a reversing valve, allowing them to both heat and cool an enclosed space.^[5]

Air conditioners, which typically use vapor-compression refrigeration, range in size from small units used in vehicles or single rooms to massive units that can cool large buildings.^[6] Air source heat pumps, which can be used for heating as well as cooling, are becoming increasingly common in cooler climates.

Air conditioners can reduce mortality rates due to higher temperature.^[7] According to the International Energy Agency (IEA) 1.6 billion air conditioning units were used globally in 2016.^[8] The United Nations called for the technology to be made more sustainable to mitigate climate change and for the use of alternatives, like passive cooling, evaporative cooling, selective shading, windcatchers, and better thermal insulation.

History

[edit]

Air conditioning dates back to prehistory.^[9] Double-walled living quarters, with a gap between the two walls to encourage air flow, were found in the ancient city of Hamoukar, in modern Syria.^[10] Ancient Egyptian buildings also used a wide variety of passive air-conditioning techniques.^[11] These became widespread from the Iberian Peninsula through North Africa, the Middle East, and Northern India.^[12]

Passive techniques remained widespread until the 20th century when they fell out of fashion and were replaced by powered air conditioning. Using information from engineering studies of traditional buildings, passive techniques are being revived and modified for 21st-century architectural designs.^[13][12]

Air conditioners allow the building's indoor environment to remain relatively constant, largely independent of changes in external weather conditions and internal heat loads. They also enable deep plan buildings to be created and have allowed people to live comfortably in hotter parts of the world.^[14]

Development

[edit]

Preceding discoveries

[edit]

In 1558, Giambattista della Porta described a method of chilling ice to temperatures far below its freezing point by mixing it with potassium nitrate (then called "nitre") in his popular science book Natural Magic.^[15][16][17] In 1620, Cornelis Drebbel demonstrated "Turning Summer into Winter" for James I of England, chilling part of the Great Hall of Westminster Abbey with an apparatus of troughs and vats.^[18] Drebbel's contemporary Francis Bacon, like della Porta a believer in science communication, may not have been present at the demonstration, but in a book published later the same year, he described it as "experiment of artificial freezing" and said that "Nitre (or rather its spirit) is very cold, and hence nitre or salt when added to snow or ice intensifies the cold of the latter, the nitre by adding to its cold, but the salt by supplying activity to the cold of the snow."^[15]

In 1758, Benjamin Franklin and John Hadley, a chemistry professor at the University of Cambridge, conducted experiments applying the principle of evaporation as a means to cool an object rapidly. Franklin and Hadley confirmed that the evaporation of highly volatile liquids (such as alcohol and ether) could be used to drive down the temperature of an object past the freezing point of water. They experimented with the bulb of a mercury-in-glass thermometer as their object. They used a bellows to speed up the evaporation. They lowered the temperature of the thermometer bulb down to −14 °C (7 °F) while the ambient temperature was 18 °C (64 °F). Franklin noted that soon after they passed the freezing point of water 0 °C (32 °F), a thin film of ice formed on the surface of the thermometer's bulb and that the ice mass was about 6 mm (1⁄4 in) thick when they stopped the experiment upon reaching −14 °C (7 °F). Franklin concluded: "From this experiment, one may see the possibility of freezing a man to death on a warm summer's day."^[19]

The 19th century included many developments in compression technology. In 1820, English scientist and inventor Michael Faraday discovered that compressing and liquefying ammonia could chill air when the liquefied ammonia was allowed to evaporate.^[20] In 1842, Florida physician John Gorrie used compressor technology to create ice, which he used to cool air for his patients in his hospital in Apalachicola, Florida. He hoped to eventually use his ice-making machine to regulate the temperature of buildings.^[20][21] He envisioned centralized air conditioning that could cool entire cities. Gorrie was granted a patent in 1851,^[22] but following the death of his main backer, he was not able to realize his invention.^[23] In 1851, James Harrison created the first mechanical ice-making machine in Geelong, Australia, and was granted a patent for an ether vapor-compression refrigeration system in 1855 that produced three tons of ice per day.^[24] In 1860, Harrison established a second ice company. He later entered the debate over competing against the American advantage of ice-refrigerated beef sales to the United Kingdom.^[24]

First devices

[edit]

Electricity made the development of effective units possible. In 1901, American inventor Willis H. Carrier built what is considered the first modern electrical air conditioning unit.^{[25][26][27][28]} In 1902, he installed his first air-conditioning system, in the Sackett-Wilhelms Lithographing & Publishing Company in Brooklyn, New York.^[29] His invention controlled both the temperature and humidity, which helped maintain consistent paper dimensions and ink alignment at the printing plant. Later, together with six other employees, Carrier formed The Carrier Air Conditioning Company of America, a business that in 2020 employed 53,000 people and was valued at $18.6 billion.^[30][31]

In 1906, Stuart W. Cramer of Charlotte, North Carolina, was exploring ways to add moisture to the air in his textile mill. Cramer coined the term "air conditioning" in a patent claim which he filed that year, where he suggested that air conditioning was analogous to "water conditioning", then a well-known process for making textiles easier to process.^[32] He combined moisture with ventilation to "condition" and change the air in the factories; thus, controlling the humidity that is necessary in textile plants. Willis Carrier adopted the term and incorporated it into the name of his company.^[33]

Domestic air conditioning soon took off. In 1914, the first domestic air conditioning was installed in Minneapolis in the home of Charles Gilbert Gates. It is, however, possible that the considerable device (c. 2.1 m × 1.8 m × 6.1 m; 7 ft × 6 ft × 20 ft) was never used, as the house remained uninhabited^[20] (Gates had already died in October 1913.)

In 1931, H.H. Schultz and J.Q. Sherman developed what would become the most common type of individual room air conditioner: one designed to sit on a window ledge. The units went on sale in 1932 at US$10,000 to $50,000 (the equivalent of $200,000 to $1,200,000 in 2024.)^[20] A year later, the first air conditioning systems for cars were offered for sale.^[34] Chrysler Motors introduced the first practical semi-portable air conditioning unit in 1935,^[35] and Packard became the first automobile manufacturer to offer an air conditioning unit in its cars in 1939.^[36]

Further development

[edit]

Innovations in the latter half of the 20th century allowed more ubiquitous air conditioner use. In 1945, Robert Sherman of Lynn, Massachusetts, invented a portable, in-window air conditioner that cooled, heated, humidified, dehumidified, and filtered the air.^[37] The first inverter air conditioners were released in 1980–1981.^[38][39]

In 1954, Ned Cole, a 1939 architecture graduate from the University of Texas at Austin, developed the first experimental "suburb" with inbuilt air conditioning in each house. 22 homes were developed on a flat, treeless track in northwest Austin, Texas, and the community was christened the 'Austin Air-Conditioned Village.' The residents were subjected to a year-long study of the effects of air conditioning led by the nation’s premier air conditioning companies, builders, and social scientists. In addition, researchers from UT’s Health Service and Psychology Department studied the effects on the "artificially cooled humans." One of the more amusing discoveries was that each family reported being troubled with scorpions, the leading theory being that scorpions sought cool, shady places. Other reported changes in lifestyle were that mothers baked more, families ate heavier foods, and they were more apt to choose hot drinks.^[40][41]

Air conditioner adoption tends to increase above around $10,000 annual household income in warmer areas.^[42] Global GDP growth explains around 85% of increased air condition adoption by 2050, while the remaining 15% can be explained by climate change.^[42]

As of 2016 an estimated 1.6 billion air conditioning units were used worldwide, with over half of them in China and USA, and a total cooling capacity of 11,675 gigawatts.^[8][43] The International Energy Agency predicted in 2018 that the number of air conditioning units would grow to around 4 billion units by 2050 and that the total cooling capacity would grow to around 23,000 GW, with the biggest increases in India and China.^[8] Between 1995 and 2004, the proportion of urban households in China with air conditioners increased from 8% to 70%.^[44] As of 2015, nearly 100 million homes, or about 87% of US households, had air conditioning systems.^[45] In 2019, it was estimated that 90% of new single-family homes constructed in the US included air conditioning (ranging from 99% in the South to 62% in the West).^[46][47]

Operation

[edit]

Operating principles

[edit]

Main article: Vapor-compression refrigeration

Cooling in traditional air conditioner systems is accomplished using the vapor-compression cycle, which uses a refrigerant's forced circulation and phase change between gas and liquid to transfer heat.^[48][49] The vapor-compression cycle can occur within a unitary, or packaged piece of equipment; or within a chiller that is connected to terminal cooling equipment (such as a fan coil unit in an air handler) on its evaporator side and heat rejection equipment such as a cooling tower on its condenser side. An air source heat pump shares many components with an air conditioning system, but includes a reversing valve, which allows the unit to be used to heat as well as cool a space.^[50]

Air conditioning equipment will reduce the absolute humidity of the air processed by the system if the surface of the evaporator coil is significantly cooler than the dew point of the surrounding air. An air conditioner designed for an occupied space will typically achieve a 30% to 60% relative humidity in the occupied space.^[51]

Most modern air-conditioning systems feature a dehumidification cycle during which the compressor runs. At the same time, the fan is slowed to reduce the evaporator temperature and condense more water. A dehumidifier uses the same refrigeration cycle but incorporates both the evaporator and the condenser into the same air path; the air first passes over the evaporator coil, where it is cooled^[52] and dehumidified before passing over the condenser coil, where it is warmed again before it is released back into the room.^{[citation needed]}

Free cooling can sometimes be selected when the external air is cooler than the internal air. Therefore, the compressor does not need to be used, resulting in high cooling efficiencies for these times. This may also be combined with seasonal thermal energy storage.^[53]

Heating

[edit]

Main article: Heat pump

Some air conditioning systems can reverse the refrigeration cycle and act as an air source heat pump, thus heating instead of cooling the indoor environment. They are also commonly referred to as "reverse cycle air conditioners". The heat pump is significantly more energy-efficient than electric resistance heating, because it moves energy from air or groundwater to the heated space and the heat from purchased electrical energy. When the heat pump is in heating mode, the indoor evaporator coil switches roles and becomes the condenser coil, producing heat. The outdoor condenser unit also switches roles to serve as the evaporator and discharges cold air (colder than the ambient outdoor air).

Most air source heat pumps become less efficient in outdoor temperatures lower than 4 °C or 40 °F.^[54] This is partly because ice forms on the outdoor unit's heat exchanger coil, which blocks air flow over the coil. To compensate for this, the heat pump system must temporarily switch back into the regular air conditioning mode to switch the outdoor evaporator coil back to the condenser coil, to heat up and defrost. Therefore, some heat pump systems will have electric resistance heating in the indoor air path that is activated only in this mode to compensate for the temporary indoor air cooling, which would otherwise be uncomfortable in the winter.

Newer models have improved cold-weather performance, with efficient heating capacity down to −14 °F (−26 °C).^[55][54][56] However, there is always a chance that the humidity that condenses on the heat exchanger of the outdoor unit could freeze, even in models that have improved cold-weather performance, requiring a defrosting cycle to be performed.

The icing problem becomes much more severe with lower outdoor temperatures, so heat pumps are sometimes installed in tandem with a more conventional form of heating, such as an electrical heater, a natural gas, heating oil, or wood-burning fireplace or central heating, which is used instead of or in addition to the heat pump during harsher winter temperatures. In this case, the heat pump is used efficiently during milder temperatures, and the system is switched to the conventional heat source when the outdoor temperature is lower.

Performance

[edit]

Main articles: coefficient of performance, Seasonal energy efficiency ratio, and European seasonal energy efficiency ratio

The coefficient of performance (COP) of an air conditioning system is a ratio of useful heating or cooling provided to the work required.^[57][58] Higher COPs equate to lower operating costs. The COP usually exceeds 1; however, the exact value is highly dependent on operating conditions, especially absolute temperature and relative temperature between sink and system, and is often graphed or averaged against expected conditions.^[59] Air conditioner equipment power in the U.S. is often described in terms of "tons of refrigeration", with each approximately equal to the cooling power of one short ton (2,000 pounds (910 kg) of ice melting in a 24-hour period. The value is equal to 12,000 BTU_IT per hour, or 3,517 watts.^[60] Residential central air systems are usually from 1 to 5 tons (3.5 to 18 kW) in capacity.^{[citation needed]}

The efficiency of air conditioners is often rated by the seasonal energy efficiency ratio (SEER), which is defined by the Air Conditioning, Heating and Refrigeration Institute in its 2008 standard AHRI 210/240, Performance Rating of Unitary Air-Conditioning and Air-Source Heat Pump Equipment.^[61] A similar standard is the European seasonal energy efficiency ratio (ESEER).^{[citation needed]}

Efficiency is strongly affected by the humidity of the air to be cooled. Dehumidifying the air before attempting to cool it can reduce subsequent cooling costs by as much as 90 percent. Thus, reducing dehumidifying costs can materially affect overall air conditioning costs.^[62]

Control system

[edit]

Wireless remote control

[edit]

Main articles: Remote control and Infrared blaster

A wireless remote controller

The infrared transmitting LED on the remote

The infrared receiver on the air conditioner

This type of controller uses an infrared LED to relay commands from a remote control to the air conditioner. The output of the infrared LED (like that of any infrared remote) is invisible to the human eye because its wavelength is beyond the range of visible light (940 nm). This system is commonly used on mini-split air conditioners because it is simple and portable. Some window and ducted central air conditioners uses it as well.

Wired controller

[edit]

Main article: Thermostat

Several wired controllers (Indonesia, 2024)

A wired controller, also called a "wired thermostat," is a device that controls an air conditioner by switching heating or cooling on or off. It uses different sensors to measure temperatures and actuate control operations. Mechanical thermostats commonly use bimetallic strips, converting a temperature change into mechanical displacement, to actuate control of the air conditioner. Electronic thermostats, instead, use a thermistor or other semiconductor sensor, processing temperature change as electronic signals to control the air conditioner.

These controllers are usually used in hotel rooms because they are permanently installed into a wall and hard-wired directly into the air conditioner unit, eliminating the need for batteries.

Types

[edit]

Types	Typical Capacity*	Air supply	Mounting	Typical application
Mini-split	small – large	Direct	Wall	Residential
Window	very small – small	Direct	Window	Residential
Portable	very small – small	Direct / Ducted	Floor	Residential, remote areas
Ducted (individual)	small – very large	Ducted	Ceiling	Residential, commercial
Ducted (central)	medium – very large	Ducted	Ceiling	Residential, commercial
Ceiling suspended	medium – large	Direct	Ceiling	Commercial
Cassette	medium – large	Direct / Ducted	Ceiling	Commercial
Floor standing	medium – large	Direct / Ducted	Floor	Commercial
Packaged	very large	Direct / Ducted	Floor	Commercial
Packaged RTU (Rooftop Unit)	very large	Ducted	Rooftop	Commercial

* where the typical capacity is in kilowatt as follows:

• very small: <1.5 kW
• small: 1.5–3.5 kW
• medium: 4.2–7.1 kW
• large: 7.2–14 kW
• very large: >14 kW

Mini-split and multi-split systems

[edit]

Ductless systems (often mini-split, though there are now ducted mini-split) typically supply conditioned and heated air to a single or a few rooms of a building, without ducts and in a decentralized manner.^[63] Multi-zone or multi-split systems are a common application of ductless systems and allow up to eight rooms (zones or locations) to be conditioned independently from each other, each with its indoor unit and simultaneously from a single outdoor unit.

The first mini-split system was sold in 1961 by Toshiba in Japan, and the first wall-mounted mini-split air conditioner was sold in 1968 in Japan by Mitsubishi Electric, where small home sizes motivated their development. The Mitsubishi model was the first air conditioner with a cross-flow fan.^[64][65][66] In 1969, the first mini-split air conditioner was sold in the US.^[67] Multi-zone ductless systems were invented by Daikin in 1973, and variable refrigerant flow systems (which can be thought of as larger multi-split systems) were also invented by Daikin in 1982. Both were first sold in Japan.^[68] Variable refrigerant flow systems when compared with central plant cooling from an air handler, eliminate the need for large cool air ducts, air handlers, and chillers; instead cool refrigerant is transported through much smaller pipes to the indoor units in the spaces to be conditioned, thus allowing for less space above dropped ceilings and a lower structural impact, while also allowing for more individual and independent temperature control of spaces. The outdoor and indoor units can be spread across the building.^[69] Variable refrigerant flow indoor units can also be turned off individually in unused spaces.^{[citation needed]} The lower start-up power of VRF's DC inverter compressors and their inherent DC power requirements also allow VRF solar-powered heat pumps to be run using DC-providing solar panels.

Ducted central systems

[edit]

Split-system central air conditioners consist of two heat exchangers, an outside unit (the condenser) from which heat is rejected to the environment and an internal heat exchanger (the evaporator, or Fan Coil Unit, FCU) with the piped refrigerant being circulated between the two. The FCU is then connected to the spaces to be cooled by ventilation ducts.^[70] Floor standing air conditioners are similar to this type of air conditioner but sit within spaces that need cooling.

Central plant cooling

[edit]

See also: Chiller

Large central cooling plants may use intermediate coolant such as chilled water pumped into air handlers or fan coil units near or in the spaces to be cooled which then duct or deliver cold air into the spaces to be conditioned, rather than ducting cold air directly to these spaces from the plant, which is not done due to the low density and heat capacity of air, which would require impractically large ducts. The chilled water is cooled by chillers in the plant, which uses a refrigeration cycle to cool water, often transferring its heat to the atmosphere even in liquid-cooled chillers through the use of cooling towers. Chillers may be air- or liquid-cooled.^[71][72]

Portable units

[edit]

A portable system has an indoor unit on wheels connected to an outdoor unit via flexible pipes, similar to a permanently fixed installed unit (such as a ductless split air conditioner).

Hose systems, which can be monoblock or air-to-air, are vented to the outside via air ducts. The monoblock type collects the water in a bucket or tray and stops when full. The air-to-air type re-evaporates the water, discharges it through the ducted hose, and can run continuously. Many but not all portable units draw indoor air and expel it outdoors through a single duct, negatively impacting their overall cooling efficiency.

Many portable air conditioners come with heat as well as a dehumidification function.^[73]

Window unit and packaged terminal

[edit]

Main article: Packaged terminal air conditioner

The packaged terminal air conditioner (PTAC), through-the-wall, and window air conditioners are similar. These units are installed on a window frame or on a wall opening. The unit usually has an internal partition separating its indoor and outdoor sides, which contain the unit's condenser and evaporator, respectively. PTAC systems may be adapted to provide heating in cold weather, either directly by using an electric strip, gas, or other heaters, or by reversing the refrigerant flow to heat the interior and draw heat from the exterior air, converting the air conditioner into a heat pump. They may be installed in a wall opening with the help of a special sleeve on the wall and a custom grill that is flush with the wall and window air conditioners can also be installed in a window, but without a custom grill.^[74]

Packaged air conditioner

[edit]

Packaged air conditioners (also known as self-contained units)^[75][76] are central systems that integrate into a single housing all the components of a split central system, and deliver air, possibly through ducts, to the spaces to be cooled. Depending on their construction they may be outdoors or indoors, on roofs (rooftop units),^[77][78] draw the air to be conditioned from inside or outside a building and be water or air-cooled. Often, outdoor units are air-cooled while indoor units are liquid-cooled using a cooling tower.^{[70][79][80][81][82][83]}

Types of compressors

[edit]

Compressor types	Common applications	Typical capacity	Efficiency	Durability	Repairability
Reciprocating	Refrigerator, Walk-in freezer, portable air conditioners	small – large	very low (small capacity) medium (large capacity)	very low	medium
Rotary vane	Residential mini splits	small	low	low	easy
Scroll	Commercial and central systems, VRF	medium	medium	medium	easy
Rotary screw	Commercial chiller	medium – large	medium	medium	hard
Centrifugal	Commercial chiller	very large	medium	high	hard
Maglev Centrifugal	Commercial chiller	very large	high	very high	very hard

Reciprocating

[edit]

Main article: Reciprocating compressor

This compressor consists of a crankcase, crankshaft, piston rod, piston, piston ring, cylinder head and valves. ^{[citation needed]}

Scroll

[edit]

Main article: Scroll compressor

This compressor uses two interleaving scrolls to compress the refrigerant.^[84] it consists of one fixed and one orbiting scrolls. This type of compressor is more efficient because it has 70 percent less moving parts than a reciprocating compressor. ^{[citation needed]}

Screw

[edit]

Main article: Rotary-screw compressor

This compressor use two very closely meshing spiral rotors to compress the gas. The gas enters at the suction side and moves through the threads as the screws rotate. The meshing rotors force the gas through the compressor, and the gas exits at the end of the screws. The working area is the inter-lobe volume between the male and female rotors. It is larger at the intake end, and decreases along the length of the rotors until the exhaust port. This change in volume is the compression. ^{[citation needed]}

Capacity modulation technologies

[edit]

There are several ways to modulate the cooling capacity in refrigeration or air conditioning and heating systems. The most common in air conditioning are: on-off cycling, hot gas bypass, use or not of liquid injection, manifold configurations of multiple compressors, mechanical modulation (also called digital), and inverter technology. ^{[citation needed]}

Hot gas bypass

[edit]

Hot gas bypass involves injecting a quantity of gas from discharge to the suction side. The compressor will keep operating at the same speed, but due to the bypass, the refrigerant mass flow circulating with the system is reduced, and thus the cooling capacity. This naturally causes the compressor to run uselessly during the periods when the bypass is operating. The turn down capacity varies between 0 and 100%.^[85]

Manifold configurations

[edit]

Several compressors can be installed in the system to provide the peak cooling capacity. Each compressor can run or not in order to stage the cooling capacity of the unit. The turn down capacity is either 0/33/66 or 100% for a trio configuration and either 0/50 or 100% for a tandem.^{[citation needed]}

Mechanically modulated compressor

[edit]

This internal mechanical capacity modulation is based on periodic compression process with a control valve, the two scroll set move apart stopping the compression for a given time period. This method varies refrigerant flow by changing the average time of compression, but not the actual speed of the motor. Despite an excellent turndown ratio – from 10 to 100% of the cooling capacity, mechanically modulated scrolls have high energy consumption as the motor continuously runs.^{[citation needed]}

Variable-speed compressor

[edit]

Main article: Inverter compressor

This system uses a variable-frequency drive (also called an Inverter) to control the speed of the compressor. The refrigerant flow rate is changed by the change in the speed of the compressor. The turn down ratio depends on the system configuration and manufacturer. It modulates from 15 or 25% up to 100% at full capacity with a single inverter from 12 to 100% with a hybrid tandem. This method is the most efficient way to modulate an air conditioner's capacity. It is up to 58% more efficient than a fixed speed system.^{[citation needed]}

Impact

[edit]

Health effects

[edit]

In hot weather, air conditioning can prevent heat stroke, dehydration due to excessive sweating, electrolyte imbalance, kidney failure, and other issues due to hyperthermia.^[8][86] Heat waves are the most lethal type of weather phenomenon in the United States.^[87][88] A 2020 study found that areas with lower use of air conditioning correlated with higher rates of heat-related mortality and hospitalizations.^[89] The August 2003 France heatwave resulted in approximately 15,000 deaths, where 80% of the victims were over 75 years old. In response, the French government required all retirement homes to have at least one air-conditioned room at 25 °C (77 °F) per floor during heatwaves.^[8]

Air conditioning (including filtration, humidification, cooling and disinfection) can be used to provide a clean, safe, hypoallergenic atmosphere in hospital operating rooms and other environments where proper atmosphere is critical to patient safety and well-being. It is sometimes recommended for home use by people with allergies, especially mold.^[90][91] However, poorly maintained water cooling towers can promote the growth and spread of microorganisms such as Legionella pneumophila, the infectious agent responsible for Legionnaires' disease. As long as the cooling tower is kept clean (usually by means of a chlorine treatment), these health hazards can be avoided or reduced. The state of New York has codified requirements for registration, maintenance, and testing of cooling towers to protect against Legionella.^[92]

Economic effects

[edit]

First designed to benefit targeted industries such as the press as well as large factories, the invention quickly spread to public agencies and administrations with studies with claims of increased productivity close to 24% in places equipped with air conditioning.^[93]

Air conditioning caused various shifts in demography, notably that of the United States starting from the 1970s. In the US, the birth rate was lower in the spring than during other seasons until the 1970s but this difference then declined since then.^[94] As of 2007, the Sun Belt contained 30% of the total US population while it was inhabited by 24% of Americans at the beginning of the 20th century.^[95] Moreover, the summer mortality rate in the US, which had been higher in regions subject to a heat wave during the summer, also evened out.^[7]

The spread of the use of air conditioning acts as a main driver for the growth of global demand of electricity.^[96] According to a 2018 report from the International Energy Agency (IEA), it was revealed that the energy consumption for cooling in the United States, involving 328 million Americans, surpasses the combined energy consumption of 4.4 billion people in Africa, Latin America, the Middle East, and Asia (excluding China).^[8] A 2020 survey found that an estimated 88% of all US households use AC, increasing to 93% when solely looking at homes built between 2010 and 2020.^[97]

Environmental effects

[edit]

Space cooling including air conditioning accounted globally for 2021 terawatt-hours of energy usage in 2016 with around 99% in the form of electricity, according to a 2018 report on air-conditioning efficiency by the International Energy Agency.^[8] The report predicts an increase of electricity usage due to space cooling to around 6200 TWh by 2050,^[8][98] and that with the progress currently seen, greenhouse gas emissions attributable to space cooling will double: 1,135 million tons (2016) to 2,070 million tons.^[8] There is some push to increase the energy efficiency of air conditioners. United Nations Environment Programme (UNEP) and the IEA found that if air conditioners could be twice as effective as now, 460 billion tons of GHG could be cut over 40 years.^[99] The UNEP and IEA also recommended legislation to decrease the use of hydrofluorocarbons, better building insulation, and more sustainable temperature-controlled food supply chains going forward.^[99]

Refrigerants have also caused and continue to cause serious environmental issues, including ozone depletion and climate change, as several countries have not yet ratified the Kigali Amendment to reduce the consumption and production of hydrofluorocarbons.^[100] CFCs and HCFCs refrigerants such as R-12 and R-22, respectively, used within air conditioners have caused damage to the ozone layer,^[101] and hydrofluorocarbon refrigerants such as R-410A and R-404A, which were designed to replace CFCs and HCFCs, are instead exacerbating climate change.^[102] Both issues happen due to the venting of refrigerant to the atmosphere, such as during repairs. HFO refrigerants, used in some if not most new equipment, solve both issues with an ozone damage potential (ODP) of zero and a much lower global warming potential (GWP) in the single or double digits vs. the three or four digits of hydrofluorocarbons.^[103]

Hydrofluorocarbons would have raised global temperatures by around 0.3–0.5 °C (0.5–0.9 °F) by 2100 without the Kigali Amendment. With the Kigali Amendment, the increase of global temperatures by 2100 due to hydrofluorocarbons is predicted to be around 0.06 °C (0.1 °F).^[104]

Alternatives to continual air conditioning include passive cooling, passive solar cooling, natural ventilation, operating shades to reduce solar gain, using trees, architectural shades, windows (and using window coatings) to reduce solar gain.^{[citation needed]}

Social effects

[edit]

Socioeconomic groups with a household income below around $10,000 tend to have a low air conditioning adoption,^[42] which worsens heat-related mortality.^[7] The lack of cooling can be hazardous, as areas with lower use of air conditioning correlate with higher rates of heat-related mortality and hospitalizations.^[89] Premature mortality in NYC is projected to grow between 47% and 95% in 30 years, with lower-income and vulnerable populations most at risk.^[89] Studies on the correlation between heat-related mortality and hospitalizations and living in low socioeconomic locations can be traced in Phoenix, Arizona,^[105] Hong Kong,^[106] China,^[106] Japan,^[107] and Italy.^[108][109] Additionally, costs concerning health care can act as another barrier, as the lack of private health insurance during a 2009 heat wave in Australia, was associated with heat-related hospitalization.^[109]

Disparities in socioeconomic status and access to air conditioning are connected by some to institutionalized racism, which leads to the association of specific marginalized communities with lower economic status, poorer health, residing in hotter neighborhoods, engaging in physically demanding labor, and experiencing limited access to cooling technologies such as air conditioning.^[109] A study overlooking Chicago, Illinois, Detroit, and Michigan found that black households were half as likely to have central air conditioning units when compared to their white counterparts.^[110] Especially in cities, Redlining creates heat islands, increasing temperatures in certain parts of the city.^[109] This is due to materials heat-absorbing building materials and pavements and lack of vegetation and shade coverage.^[111] There have been initiatives that provide cooling solutions to low-income communities, such as public cooling spaces.^[8][111]

Other techniques

[edit]

Buildings designed with passive air conditioning are generally less expensive to construct and maintain than buildings with conventional HVAC systems with lower energy demands.^[112] While tens of air changes per hour, and cooling of tens of degrees, can be achieved with passive methods, site-specific microclimate must be taken into account, complicating building design.^[12]

Many techniques can be used to increase comfort and reduce the temperature in buildings. These include evaporative cooling, selective shading, wind, thermal convection, and heat storage.^[113]

Passive ventilation

[edit]

This section is an excerpt from Passive ventilation.[edit]

Passive ventilation is the process of supplying air to and removing air from an indoor space without using mechanical systems. It refers to the flow of external air to an indoor space as a result of pressure differences arising from natural forces.

There are two types of natural ventilation occurring in buildings: wind driven ventilation and buoyancy-driven ventilation. Wind driven ventilation arises from the different pressures created by wind around a building or structure, and openings being formed on the perimeter which then permit flow through the building. Buoyancy-driven ventilation occurs as a result of the directional buoyancy force that results from temperature differences between the interior and exterior.^[114]

Since the internal heat gains which create temperature differences between the interior and exterior are created by natural processes, including the heat from people, and wind effects are variable, naturally ventilated buildings are sometimes called "breathing buildings".

Passive cooling

[edit]

This section is an excerpt from Passive cooling.[edit]

Passive cooling is a building design approach that focuses on heat gain control and heat dissipation in a building in order to improve the indoor thermal comfort with low or no energy consumption.^[115][116] This approach works either by preventing heat from entering the interior (heat gain prevention) or by removing heat from the building (natural cooling).^[117]

Natural cooling utilizes on-site energy, available from the natural environment, combined with the architectural design of building components (e.g. building envelope), rather than mechanical systems to dissipate heat.^[118] Therefore, natural cooling depends not only on the architectural design of the building but on how the site's natural resources are used as heat sinks (i.e. everything that absorbs or dissipates heat). Examples of on-site heat sinks are the upper atmosphere (night sky), the outdoor air (wind), and the earth/soil.

Passive cooling is an important tool for design of buildings for climate change adaptation – reducing dependency on energy-intensive air conditioning in warming environments.^[119][120]

Daytime radiative cooling

[edit]

Passive daytime radiative cooling (PDRC) surfaces reflect incoming solar radiation and heat back into outer space through the infrared window for cooling during the daytime. Daytime radiative cooling became possible with the ability to suppress solar heating using photonic structures, which emerged through a study by Raman et al. (2014).^[122] PDRCs can come in a variety of forms, including paint coatings and films, that are designed to be high in solar reflectance and thermal emittance.^[121][123]

PDRC applications on building roofs and envelopes have demonstrated significant decreases in energy consumption and costs.^[123] In suburban single-family residential areas, PDRC application on roofs can potentially lower energy costs by 26% to 46%.^[124] PDRCs are predicted to show a market size of ~$27 billion for indoor space cooling by 2025 and have undergone a surge in research and development since the 2010s.^[125][126]

Fans

[edit]

Main article: Ceiling fan

Hand fans have existed since prehistory. Large human-powered fans built into buildings include the punkah.

The 2nd-century Chinese inventor Ding Huan of the Han dynasty invented a rotary fan for air conditioning, with seven wheels 3 m (10 ft) in diameter and manually powered by prisoners.^{[127]: 99, 151, 233} In 747, Emperor Xuanzong (r. 712–762) of the Tang dynasty (618–907) had the Cool Hall (Liang Dian 涼殿) built in the imperial palace, which the Tang Yulin describes as having water-powered fan wheels for air conditioning as well as rising jet streams of water from fountains. During the subsequent Song dynasty (960–1279), written sources mentioned the air conditioning rotary fan as even more widely used.^{[127]: 134, 151}

Thermal buffering

[edit]

In areas that are cold at night or in winter, heat storage is used. Heat may be stored in earth or masonry; air is drawn past the masonry to heat or cool it.^[13]

In areas that are below freezing at night in winter, snow and ice can be collected and stored in ice houses for later use in cooling.^[13] This technique is over 3,700 years old in the Middle East.^[128] Harvesting outdoor ice during winter and transporting and storing for use in summer was practiced by wealthy Europeans in the early 1600s,^[15] and became popular in Europe and the Americas towards the end of the 1600s.^[129] This practice was replaced by mechanical compression-cycle icemakers.

Evaporative cooling

[edit]

Main article: Evaporative cooler

In dry, hot climates, the evaporative cooling effect may be used by placing water at the air intake, such that the draft draws air over water and then into the house. For this reason, it is sometimes said that the fountain, in the architecture of hot, arid climates, is like the fireplace in the architecture of cold climates.^[11] Evaporative cooling also makes the air more humid, which can be beneficial in a dry desert climate.^[130]

Evaporative coolers tend to feel as if they are not working during times of high humidity, when there is not much dry air with which the coolers can work to make the air as cool as possible for dwelling occupants. Unlike other types of air conditioners, evaporative coolers rely on the outside air to be channeled through cooler pads that cool the air before it reaches the inside of a house through its air duct system; this cooled outside air must be allowed to push the warmer air within the house out through an exhaust opening such as an open door or window.^[131]

See also

[edit]

• Air filter
• Air purifier
• Cleanroom
• Crankcase heater
• Energy recovery ventilation
• Indoor air quality
• Particulates

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[edit]

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