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Evaporative Cooling

Method of cooling that uses water evaporation to cool warm air.

Evaporator Coil

Located inside the home or business, a series or network of tubes filled with refrigerant that removes heat and moisture from indoor air as liquid refrigerant evaporates.


Absorbs heat or liquid from the surrounding air and moves it outside the refrigerated area by means of a refrigerant. Also known as a cooling coil, blower coil, chilling unit or indoor coil.

Energy Efficiency Ratio (EER)

The ratio of an air conditioning unit’s cooling capacity in BTUs per hour to the total electrical energy consumed in watts.

Emergency Heat (Supplemental or Auxiliary Heat)

The backup heat built into a heat pump system.

Electronic Air Cleaner

Type of air purifier that uses electrically charged filters to minimize airborne contaminants.


A fuel-efficiency rating similar to the miles-per-gallon rating on your car.