Glossary Terms

Abbreviation for American Gas Association, Inc.

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.

A heat exchanger (evaporator coil) consisting of two diagonal coils that are joined together in a manner that looks like the letter “A”.

Abbreviation for equipment capable of operating on alternating or direct current.

Of or pertaining to sound.

Air-Conditioning Contractors of America.

AC, A.C. or Ac may refer to: Air conditioning, technologies for altering the temperature and humidity of air; Alternating current, a type of electrical current in which the current repeatedly changes direction.