Một số từ ngữ viết tắt trong chuyên ngành HVAC:

AC - Air Conditioning or Alternating Current 
AFUE - Annual Fuel Utilization Efficiency 
AHU - Air Handling Unit 
AI - Analog Input 
AO - Analog Output 

AQS - Air Quality Systems 
AWG - American Wire Gage 
BACnet - Computer communication protocol for building automation systems and control networks 
BAS - Building Automation System 
BI - Binary Input 
BO - Binary Output 
BP - Backflow Preventer 
BTU - British Thermal Unit 
BTUh - Brtish Thermal Units per Hour 
HVAC - Abbreviations & Acronyms
CAV - Constant Air Volume 
CD - Cold Deck
CFC - ChloroFluoroCarbon 
CFM - Cubic Feet per Minute 
CHWP - Chilled Water Pump 
CHWR - Chilled Water Return 
CHWS - Chilled Water Supply 
COP - Coefficienct of Performance 
CSR - Capacitor Start Capacitor Run 
CV - Constant Volume 
CWP - Condenser Water Pump 
CWR - Condenser Water Return 
CWS - Condenser Water Supply 
DA - Discharge Air or Direct Acting 
DAT - Discharge Air Temperature 
DB - Dry Bulb or Dead Band 
DC - Direct Current 
DCBP - Double Check Backflow Preventer 
DD - Degree Day 
DDC - Direct Digital Control 
DI - Digital Input 
DO - Digital Output 
DP - Differential Pressure
DPDT - Double Pole Double Throw 
DPST - Double Pole Single Throw 
DSI - Direct Spark ignition 
DX - Direct Expansion 
EDR - Equivalent Direct Radiation 
EER - Energy Efficiency Ratio 
EMF - Electromotive Force 
EF - Exhaust Fan 
EMS - Energy Management System 
EP - Electric to Pnuematic 
ERV - Energy Recovery Ventilator 
EXV - Electronic Expansion Valve 
FA - Fire Alarm 
FCU - Fan Coil Unit
FD - Fire Damper 
FLA - Full Load Amps 
FPM - Feet Per Minute 
FS - Float Switch 
F & T - Float & Thermostatic 
GPM - Gallons per Minute 
GWP - Global Warming Potential 
HEPA - High Efficiency Particulate Arresting 
HCFC – HydroChloro FluoroCarbon 
HD - Hot Deck 
HFC - HydroFluoroCarbon 
HOA - Hand Off Auto 
HP - High Pressure or Horse Power 
HPS - High Pressure Steam
HRV - Heat Recovery Ventilator 
HSI - Hot Surface Ignition 
HSPF - Heating Seasonal Performance Factor 
HVAC - Heating, Ventilation, & Air Conditioning 
HVACR - Heating, Ventilation, Air Conditioning, & Refrigeration 
HWP - Hot Water Pump 
HWR - Hot Water Return 
HWS - Hot Water Supply 
HX - Heat Exchanger 
HZ - Hertz 
I/O – Input /Output 
IAQ - Indoor Air Quality 
in. Hg - inches of mercury vacuum 
in. WC - inches of Water Column 
JB - Junction Box 
KO - Knock Out
KW - Kilowatts 
LL - Low Limit 
LP - Low Pressure or Liquified Petroleum 
LPS - Low Pressure Steam 
LRA - Locked Rotor Amps 
LWCO - Low Water Cut Off 
MA - Mixed Air 
MAT - Mixed Air Temperature 
MAU - Make-up Air Unit 
MCC - Motor Control Center 
MFD - Micro-Farad 
MP - Motor Protector
MPT - Male Pipe Thread 
NC - Normally Closed 
NEC - National Electric Code 
NFPA - National Fire Protection Association 
NO - Normally Open 
NPT - National Pipe Thread 
NTC - Negative Temperature Coefficient 
OA - Outside Air
OAT - Outside Air Temperature 
OP - Oil Pressure 
ODP - Ozone Depletion Potential 
PCB - Printed Circuit Board 
PE - Pneumatic to Electric 
PID - Proportional, Integral, & Derivative 
PRV - Pressure Reducing Valve 
PSC - Permanent Split Capacitor 
PSIA - Pounds per Square Inch Absolute 
PSIG - Pounds per Square Inch Gauge 
PT - Pressure Temperature 
PTAC - Portable Terminal Air Conditioner 
PTC - Positive Temperature Coefficient
PWM - Pulse Width Modulation 
RA - Return Air or Reverse Acting 
RAT - Return Air Temperature 
RF - Return Fan 
RH - Relative Humidity 
RPBP - Reduced Pressure Backflow Preventer (sometimes also seen as RPZ) 
RPM - Revolutions Per Minute 
RTU - Roof Top Unit 
RV - Reversing Valve 
SA - Supply Air 
SAT - Supply Air Temperature 
SD - Smoke Damper
SEER - Seasonal Energy Efficiency Ratio 
SF - Service Factor or Supply Fan 
SH - Super Heat 
SP - Static Pressure or Set Point 
SPDT - Single Pole Double Throw 
SPST - Single Pole Single Throw 
SV - Solenoid Valve 
TD - Temperature Difference or Time Delay 
TDS - Total Dissolved Solids 
TEV - Thermostatic Expansion Valve (sometimes also seen as TXV) 
Ton - Ton of refrigeration effect 
UH - Unit Heater
UV - Ultra-Violet or Unit Ventilator 
VAV - Variable Air Volume 
VFD - Variable Frequency Drive 
VSD - Variable Speed Drive 
VVT - Variable Volume/Temperature 
W - Watt 
WB - Wet Bulb 
WC - Water Column 
XFMR - Transformer 
ZD - Zone Damper