ACCA
Air Conditioning Contractors of America.
Acoustical
Of or pertaining to sound.
AC or DC
Abbreviation for equipment capable of operating on alternating or direct current.
AC
Abbreviation for alternating current, an electric current that reverses its direction many times a second.
A-Coil
A heat exchanger containing two diagonal coils that are connected together in a manner that resembles the letter "A".