AC
Air Conditioning
ACH
Air Changes per Hour
AFUE
Annual Fuel Utilization Efficiency
AHRI
Air-Conditioning, Heating, and Refrigeration Institute
AHU
Air-Handling Unit
BTU
British Thermal Unit
BTUH
British Thermal Units per Hour
CFM
Cubic Feet per Minute
COP
Coefficient of Performance
ECM
Electronically Commutated Motor
EER2
Energy Efficiency Ratio 2
ERV
Energy Recovery Ventilator
ESP
External Static Pressure
FLA
Full Load Amps
FPM
Feet per Minute
HP
Horsepower
HRV
Heat Recovery Ventilator
HSPF2
Heating Seasonal Performance Factor 2
HVAC
Heating, Ventilation and Air Conditioning
IAQ
Indoor Air Quality
ID
Inside Diameter
LRA
Locked Rotor Amps
MCA
Minimum Circuit Ampacity
MERV
Minimum Efficiency Reporting Value
MOCP
Maximum Overcurrent Protection
NEMA
National Electrical Manufacturers Association
OD
Outside Diameter
OEM
Original Equipment Manufacturer
PSI
Pounds per Square Inch
RLA
Rated Load Amps
RH
Relative Humidity
RPM
Revolutions per Minute
SEER2
Seasonal Energy Efficiency Ratio 2
SHR
Sensible Heat Ratio
SP
Static Pressure
TD
Temperature Difference
TESP
Total External Static Pressure
TXV
Thermostatic Expansion Valve
VAC
Volts Alternating Current
VDC
Volts Direct Current
VFD
Variable Frequency Drive