POST a QUESTION or READ FAQs about how to diagnose and repair air conditioning and heat pump systems.
What are the Parts of an Air Conditioning or Heat Pump System & How do Air Conditioners & Heat Pumps Work? If your air conditioner or heat pump system is not working, start at LOST COOLING CAPACITY for help in diagnosing and repairing the trouble. A detailed list and photos of air conditioner components can be seen at AIR CONDITIONER COMPONENT PARTS.
A air conditioning or heat pump compressor which compresses low pressure refrigerant gas into a high pressure, high temperature gas.
The air conditioner or heat pump compressor unit is basically a high pressure pump driven by an electric motor. A condenser or condensing unit: typically a condensing coil inside which high temperature high pressure refrigerant gas flows, and over which a fan blows air to cool the refrigerant gas back to a liquid state (thus transferring heat from the refrigerant gas to the air being blown by the fan). An evaporator coil or cooling coil: typically the cooling coil is a section of finned tubing (it looks a lot like a car radiator) into which liquid refrigerant is metered and permitted to evaporate from liquid to gas state inside the coil. Evaporative cooling systems, or swamp coolers are discussed separately at EVAPORATIVE COOLING SYSTEMS. An air handler and blower unit which provides a fan to blow building air across or through the evaporator coil. A duct system which distributes conditioned air from the air handler in to the occupied space (supply ducts), and which takes air from the occupied space and returns it to the cooling system air handler. Details of how heat pumps work, are inspected, diagnosed, and repaired begin at HEAT PUMPS. Air conditioner controls and features, which include a room thermostat, electrical switches, fuses or circuit breakers, condensate handling system, and air filters. After completing the programs below, new technicians generally need between 6 months to 2 years of field experience before they are considered proficient. HVAC Excellence is a not for profit organization that has been serving the HVACR industry since 1994. NCCER is a not-for-profit education foundation created to develop industry-driven standardized craft training programs with portable credentials and help address the critical workforce shortage facing the construction industry. In addition, all technicians who purchase or work with refrigerants must be certified in their proper handling. NOTE: when considering an HVAC training course or school, check the HVAC education accrediting associations listed above.


NATE is supported by ASHRAE, the US EPA, and a host of other trade and professional associations.
Features covered in depth include: descriptions of typical styles, characteristics and requirements, testing, listing, reporting, certifying, packaging and product marking. Guidelines for proper installation are treated and illustrated in depth, featuring connections, splices and proper support methods for flexible duct. NOTE: because Wikipedia entries are fluid and can be amended in real time, we cite the retrieval date of Wikipedia citations and we do not assert that the information found there is necessarily authoritative. Our recommended books about building & mechanical systems design, inspection, problem diagnosis, and repair, and about indoor environment and IAQ testing, diagnosis, and cleanup are at the InspectAPedia Bookstore. Complete List of Air Conditioning & Heat Pump Design, Inspection, Repair Books at the InspectAPedia Bookstore. The Illustrated Home illustrates construction details and building components, a reference for owners & inspectors.
Detailed information about air conditioning purchase, installation, troubleshooting & repair is provided here - CONTACT us if you can't find something.
Usually the compressor is in the outdoor portion of an air conditioning or heat pump system.
The condenser unit is basically a coil of finned tubing and a fan to blow air across the coil.
The change of state of the refrigerant, from hot high pressure gas to a liquid releases heat, including heat collected inside the building) to the outdoors. This state change of the refrigerant, from liquid to gas, absorbs heat, cooling the evaporator coil surface and thus cooling indoor air blown across the cooling coil.
The air handler blower fan unit moves building air across the evaporator coil surface in order to condition building air by cooling it (and thus also by removing moisture from the cooled air).
So in air conditioning mode the heat pump is moving heat from inside the building to outdoors while in heating mode the heat pump is moving heat from outdoor air (or water in some designs) to the building interior. We explain how to inspect & repair central air conditioning systems and for homeowners we also answer basic HVAC questions such as what are the basic air conditioning components? Department of Labor website describes HVAC jobs and the employment outlook for HVAC technicians.
It is our goal to improve competency through validation of the technical education process. This programmatic accreditation program is the only one that is supported by the major industry associations.


The text is intended as a reference guide to help building owners operate and maintain their home effectively. Upgrade your look…Nike G87 Training Tank Top for Women Nike G87 Training Tank Top for Women Flat-seams reduce irritation caused by chafing. Usually the condenser unit is in the outdoor portion of an air conditioning system, often packaged along with the compressor motor discussed above. Because the ability of a heat pump to extract heat from outdoor air diminishes at low outdoor temperatures, heat pump systems in northern climates also include a backup or auxiliary heating system. By setting standards and verifying that they have been met, we inspire the industry to excel. We know that all of the challenges that face our industry are achievable by continuous improvement in the way that we prepare technicians.
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Thanks to Alan Carson and Bob Dunlop, for permission for InspectAPedia to use text excerpts from The Home Reference Book & illustrations from The Illustrated Home.
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