KILOWATT

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A unit used to express 1,000 Watts. Denoted as “kW.” Note that the “W” in “kW” is always capitalized because the Watt unit was named after a person.

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INDOOR COILS

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Split-system home comfort systems use two main components to deliver air for a comfortable living environment. The indoor coil is the device responsible for transferring heat from indoors to the outdoors (or the reverse in the case of a heat pump in heating mode). Most modern systems are designed to achieve maximum efficiency when the indoor unit (coils and blower) is properly matched with the outdoor unit (air conditioner or heat pump). For best results, be sure to replace both the indoor and outdoor units at the same time.

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HVAC

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Heating, Ventilating and Air Conditioning. Used to refer to the industry at large, particularly dealers of heating and air conditioning equipment.

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HSPF

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Heating Seasonal Performance Factor. It measures the efficiency of the heating portion of your heat pump. The Department of Energy minimum is 6.8. (Similar to SEER.)

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HEAT EXCHANGER

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Responsible for transferring heat from furnace burners to the blower.

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EVAPORATOR COIL/EVAPORATOR

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An integral part of the indoor unit of a heat pump or air conditioning system. So called because when warm air passes over a coil filled with liquid refrigerant, the refrigerant itself evaporates and absorbs some of the heat. This gas refrigerant is then pumped to the outdoor coil, where it releases heat into the surrounding air and returns to its liquid state.

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EFFICIENCY

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A general term used to describe how effectively a heat pump, air conditioning system, or furnace converts incoming energy to outgoing energy. The higher the number, the more efficient the unit, and the lower the operating costs.

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EER

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Energy Efficiency Ratio. The ratio of the cooling capacity of the air conditioner in BTUs per hour to the total electrical input in watts. This measure is determined by comparing test units to the Air Conditioning and Refrigeration Institute specifications.

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DUCT/DUCTWORK/DUCTING

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A central heating and air conditioning system uses many components to heat and cool air. This warm and cool air is then transferred to different registers throughout the house via special, flexible, large-diameter pipes or ducts. The system of ducts throughout your house is often referred to as ductwork or ducting.

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DOE

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A federal agency, the Department of Energy, sets the standards for efficiency throughout the HVAC Industry and monitors consumption of energy sources.

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