A heat exchanger consisting of two diagonal coils that are joined together in a manner that looks like the letter "A". A-Coils are most commonly found on Mobile Home systems used for both Air Conditioning and Heat Pumps.

Abbreviation for Air Conditioner. Refer to Air Conditioner or Air Conditioning.

Abbreviation for (air conditioner) and (alternating current), alternating current is a type of electric current in which the polarity is constantly reversing causing the electron flow to reverse.

Of or pertaining to sound.

The use of compressor equipment to cool and dehumidify the air.

Annual Fuel Utilization Efficiency. A measure of a gas furnace's efficiency in converting fuel to energy - the higher the rating, the more efficient the unit.

Abbreviation for American Gas Association, Inc.

Air-conditioning, heating, and refrigeration Institute. AHRI is one of the largest trade associations in the USA, representing more than 300 heating, water heating, ventilation, air conditioning and commercial refrigeration manufacturers within the global HVACR industry.

Making adjustments in an air conditioning and heating system to deliver the correct amount of air flow to each room.

(also Air Filtration System) Removes airborne allergens from your home.

Any device or equipment that is used to control indoor air temperature, relative humidity, purity, movement and general quality of the air.

Making indoor air more comfortable by transferring heat and humidity to the outside air.

In heating and air conditioning, the media, element, or device used to remove unwanted particles, vapors, or odors from indoor air. Air filters serve two functions: to protect the equipment from damage and improve indoor air quality for people.

(also Air Cleaner) Removes airborne allergens from your home.

(also Air flow volume) The amount of air the system circulates through your home, expressed in cubic feet per minute (cfm). Proper air flow depends on the outdoor unit, the indoor unit, the ductwork and even whether the filters are clean.

(also Electric Furnace) An air moving and/or mixing unit. Residential air handlers include a blower, a coil, an expansion device, a heater rack and filter. Heaters (heat strips) for air handlers are sold as accessories. In some models heaters (heat strips) are factory installed. In some systems a furnace handles this function.

The unwanted entry of air into a building. This air enters through gaps and cracks commonly found around plumbing, electrical outlets, and around windows and doors. Infiltration can be intensified by atmospheric conditions such as differences in temperature or high winds.

The use of ambient air as the heat source or heat sink with heat pumps.

(also Vent) A general term that describes the port where air enters (or exits) a duct, room or area. Since warm or cool air exists from them, the supply air vents that serve a room are the points most often described by the term.

Using a fan to move heat away from the condenser coil to the outside air.

The temperature of the air surrounding HVAC equipment.

Abbreviation for Air Conditioning and Refrigeration Institute - a non-profit organization of heating, air conditioning and refrigeration manufacturers. They test and rate heat pumps and air conditioners and publish standards.

Abbreviation for American Society of Heating, Refrigeration and Air Conditioning Engineers

British thermal unit; the amount of heat required to raise or lower the temperature of one pound of water one degree Fahrenheit. The heat extracted from your home by an air conditioner is measured in BTUs.

British Thermal Units per hour - one ton of cooling capacity equals 12,000 BTUh.