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Seasonal Energy Efficiency Ratio, an equipment efficiency rating that measures how much energy it takes to cool the air. The new minimum efficiency standard (effective January 2006) is 13 SEER. All new units must now meet this standard

The Air Conditioning Contractors of America, a national trade association that represents heating, ventilation, air conditioning, and refrigeration contractors.

Equipment with a heating element and/or cooling coil and other components in a cabinet or casing.

Air-Conditioning and Refrigeration Institute, a non-profit, voluntary organization composed of heating, air conditioning and refrigeration manufacturers. ARI publishes standards for testing and rating heat pumps and air conditioners.

Adjusting an AC system so that the right amount of air is delivered to the right places in order to achieve the right heating or cooling effect.

British Thermal Unit, the measurement of heating and air conditioning capacity. A BTU is the amount of heat that must be added to one pound of water to raise its temperature one degree Fahrenheit.

Chlorofluorocarbons, used as a refrigerant in air conditioners and heat pumps, linked to the depletion of the ozone layer.

Coefficient of performance, an efficiency ratio that compares the amount of heat delivered to the amount of energy used. As with MPG on a car, the higher the score, the more energy efficient the equipment is.

A heating or cooling element made of pipe or tubing, usually with plates or fins.