100+ HVAC Acronyms And Abbreviations At One Place | 2020 Updated List
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By Charlie /
July, 04, 2025
Yes, We understand your excitement if you belong to the industry like Heating , ventilation , and air conditioning (HVAC
So here we go with the list from A to Z. Final scope tries to collect almost all but we are always welcome if you suggest some more or if we missed out any. So now have a look and hit the comment section if you have any abbreviations related to HVAC in your bucket.
A compressed air line or area AC Air Conditioning ACD Automatic Control Damper ACH Air Changes per Hour ACM Asbestos Containing Material AD Access Door AEE Association of Energy Engineers AF Air Foil AFD Adjustable Frequency Drive AFUE Annual Fuel Efficiency Ratio AHU Air Handling Unit AI Analog Input AMP Ampere AO Analog Output AP Access Panel APD Air Pressure Drop AS Air Stream ASHRAE American Society of Heating Refrigeration and Air Conditioning Engineers ATC Automatic Temperature Control ATM Atmosphere
B Boiler BACnet A Data Communication Protocol for Building Automation and Control
Networks BAS Building Automation System BCA Building Commissioning Association BDD Back-Draft Damper BHP Brake Horsepower BI Backward Incline BO Binary Output BOD Bottom of Duct BSLN Baseline BTU British Thermal Unit BTUH Brtish Thermal Units / Hour BY Base Year
CAV Constant Air Volume CD Cold Deck CDD Cooling Degree Days CEM Certified Energy Manager CENT Center or Centrifugal CF Cubic Feet CFC ChloroFluoroCarbon CFM Cubic Feet per Minute CH Chiller CHW Chilled Water CHWP Chilled Water Pump CHWR Chilled Water Return CHWRT Chilled Water Return Temperature CHWS Chilled Water Supply CHWST Chilled Water Supply Temperature CLF Cooling Load Factor CLTD Cooling Load Temperature Difference CO Carbon Monoxide CONN Connection COP Coefficient Of Performance CRAC Computer Room Air Conditioner CT Cooling Tower CTBD Cooling Tower Blow Down CUH Cabinet Unit Heater CV Constant Volume CVRMSE Coefficient of Variation of the Root Mean Square of the Error CWP Condenser Water Pump CWR Condenser Water Return CWRT Condenser Water Return Temperature CWS Condenser Water Supply CWST Condenser Water Supply Temperature CY Current Year
D Drain DA Discharge Air DB Data Base DC Direct Current DCV Demand Controlled Ventilation DD Degree Day DDC Direct Digital Control DEG Degree DH Duct Heater DI Digital Input DIA Diameter DIM Dimension DO Digital Output DP Dew Point DX Direct Expansion
EA Each or Exhaust Air EAHU Exhaust Air Handling Unit EAT Entering Air Temperature ECM Electronically Commutated Motor ECO Energy Conservation Opportunity EDH Electric Duct Heater EEM Energy Efficiency Measure EER Energy Efficiency Ratio EF Exhaust Fan EH Electric Heater EMER Emergency EMS Energy Management System ESCO Energy Service Company ESP External Static Pressure ET Expansion Tank EUH Electric Unit Heater EWT Entering Water Temperature EXH or EX Exhaust EXP Expansion EXT External
F Fahrenheit FA Free Area or Fire Alarm FC Forward Curve FCU Fan Coil Unit FD Floor Drain, Fire Damper, or Fire Department FIM Facility Improvement Measure FLA Full Load Amps FLEX Flexible FLRDR Floor Drain FMS Facility Management System FPM Feet Per Minute FPS Feet per Second FRP Fiberglass Reinforced Plastic FS Flow Switch FT Feet FTR Fin Tube Radiation FW Feed Water
G Gas GA Gauge GAL Gallons GALV Galvanized GFU Glycol Feed Unit GPH Gallons per Hour GPM Gallons Per Minute GR Grade GUI Graphical User Interface
HB Hose Bib (Connection) HCFC Hydrochlorocfuorocarbon HD Hot Deck HDD Heating Degree Days HEPA High Efficiency Particulate Arresting HFC HydroFluoroCarbon HHV Higher Heating Value HHWP Heating Hot Water Pump HHWR Heating Hot Water Return HHWS Heating Hot Water Supply HL High Limit HP Horsepower or High Point HPS High Pressure Steam HR Heat Recovery HRU Heat Recovery Unit HRV Heat Recovery Ventilator HSPF Heating Seasonal Performance Factor HTG Heating HVAC Heating Ventilation and Air Conditioning HWP Hot Water Pump HWR Hot Water Return HWRT Hot Water Return Temperature HWS Hot Water Supply HWST Hot Water Supply Temperature HX Heat Exchanger HZ Hertz (Cycles per Second)
I/O Input Output IAQ Indoor Air Quality ID Inside Diameter IN Inches IPMVP International Performance Measurement and Verification Protocol IR Infra-Red
LAT Leaving Air Temperature LB Pound LD Linear Diffuser LF Linear Feet LHV Lower Heating Value LL Low Limit LON Local Operating Network LP Low Pressure LPS Low Pressure Steam LRA Locked Rotor Amps LUVR or LVR Louver LVDR Louvered Door LVG Leaving LWBT Leaving Wet Bulb Temperature LWT Leaving Water Temperature
M&V Measurement and Verification MA Mixed Air MAT Mixed Air Temperature MAX Maximum MBH 1000 BTUH MCA Minimum Circuit Amps MCC Motor Control Center MD Motorized Damper MECH Mechanical MIN Minimum MU Make-Up Water MUA Make-up Air Unit MX Metrix Utility Accounting System MZ Multi-Zone
NC Normally Closed NEMA National Electrical Manufacturers Association NO Normally Open NOM Nominal NPSH Net Positive Suction Head
OA Outside Air OAI Outside Air Intake OAP Outside Air Percentage OAT Outside Air Temperature OC On Center OD Outside Diameter ODP Open Drip Proof OV Outlet Velocity OWS Operator Work Station
PC Performance Contracting PCF Pounds per Cubic Foot PD Pressure Drop PE Professional Engineer PH Pre-Heat PID Proportional Integral Derivative PRV Pressure Relief Valve PSI Pounds per Square Inch PSIA Pounds per Square Inch – Absolute PSID Pounds per Square Inch – Differential PSIG Pounds per Square Inch – Gauge PTAC Packaged Terminal Air Conditioner PVC Polyvinyl Chloride
R Radius RA Return Air RET Return RF Return Fan RH Reheat RLA Running Load Amps RLF Relief RPM Revolutions Per Minute RTD Resistance Temperature Detector RTU Roof Top Unit
SA Supply Air SAT Supply Air Temperature SC Shading Coefficient SCR Screen SCT Saturated Condensing Temperature SD Smoke Detector or Smoke Damper SE Smoke Exhaust SEER Seasonal Energy Efficiency Ratio SEN Sensible SF Supply Fan SFD Combination Smoke / Fire Damper SHC Sensible Heat Capacity SHFG Solar Heat Gain Factor SHR Sensible Heat Ratio SP Set Point SS Stainless Steel SUP Supply SWP Steam Working Pressure
T Temperature TEFC Totally Enclosed Fan Cooled TEMP Temperature TEV Thermostatic Expansion Valve TOD Time Of Day TON 12,000 BTUH (Cooling Capacity) TORR Millimeter of Mercury (mmHg) TSP Total Static Pressure TSTAT Thermostat TXV Thermostatic Expansion Valve TYP Typical
UC Undercut (Door) UH Unit Heater UV UltraViolet
V Volts VAV Variable Air Volume VD Volume Damper VEL Velocity VFD Variable Frequency Drive VSD Variable Speed Drive VSP Variable Speed Pump(ing)
WB Wet Bulb WC Water Column WG Water Gauge WPD Water Pressure Drop WTD Water Temperature Difference
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So here we go with the list from A to Z. Final scope tries to collect almost all but we are always welcome if you suggest some more or if we missed out any. So now have a look and hit the comment section if you have any abbreviations related to HVAC in your bucket.
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A compressed air line or area AC Air Conditioning ACD Automatic Control Damper ACH Air Changes per Hour ACM Asbestos Containing Material AD Access Door AEE Association of Energy Engineers AF Air Foil AFD Adjustable Frequency Drive AFUE Annual Fuel Efficiency Ratio AHU Air Handling Unit AI Analog Input AMP Ampere AO Analog Output AP Access Panel APD Air Pressure Drop AS Air Stream ASHRAE American Society of Heating Refrigeration and Air Conditioning Engineers ATC Automatic Temperature Control ATM Atmosphere
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B Boiler BACnet A Data Communication Protocol for Building Automation and Control\n Networks BAS Building Automation System BCA Building Commissioning Association BDD Back-Draft Damper BHP Brake Horsepower BI Backward Incline BO Binary Output BOD Bottom of Duct BSLN Baseline BTU British Thermal Unit BTUH Brtish Thermal Units / Hour BY Base Year
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CAV Constant Air Volume CD Cold Deck CDD Cooling Degree Days CEM Certified Energy Manager CENT Center or Centrifugal CF Cubic Feet CFC ChloroFluoroCarbon CFM Cubic Feet per Minute CH Chiller CHW Chilled Water CHWP Chilled Water Pump CHWR Chilled Water Return CHWRT Chilled Water Return Temperature CHWS Chilled Water Supply CHWST Chilled Water Supply Temperature CLF Cooling Load Factor CLTD Cooling Load Temperature Difference CO Carbon Monoxide CONN Connection COP Coefficient Of Performance CRAC Computer Room Air Conditioner CT Cooling Tower CTBD Cooling Tower Blow Down CUH Cabinet Unit Heater CV Constant Volume CVRMSE Coefficient of Variation of the Root Mean Square of the Error CWP Condenser Water Pump CWR Condenser Water Return CWRT Condenser Water Return Temperature CWS Condenser Water Supply CWST Condenser Water Supply Temperature CY Current Year
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D Drain DA Discharge Air DB Data Base DC Direct Current DCV Demand Controlled Ventilation DD Degree Day DDC Direct Digital Control DEG Degree DH Duct Heater DI Digital Input DIA Diameter DIM Dimension DO Digital Output DP Dew Point DX Direct Expansion
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EA Each or Exhaust Air EAHU Exhaust Air Handling Unit EAT Entering Air Temperature ECM Electronically Commutated Motor ECO Energy Conservation Opportunity EDH Electric Duct Heater EEM Energy Efficiency Measure EER Energy Efficiency Ratio EF Exhaust Fan EH Electric Heater EMER Emergency EMS Energy Management System ESCO Energy Service Company ESP External Static Pressure ET Expansion Tank EUH Electric Unit Heater EWT Entering Water Temperature EXH or EX Exhaust EXP Expansion EXT External
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F Fahrenheit FA Free Area or Fire Alarm FC Forward Curve FCU Fan Coil Unit FD Floor Drain, Fire Damper, or Fire Department FIM Facility Improvement Measure FLA Full Load Amps FLEX Flexible FLRDR Floor Drain FMS Facility Management System FPM Feet Per Minute FPS Feet per Second FRP Fiberglass Reinforced Plastic FS Flow Switch FT Feet FTR Fin Tube Radiation FW Feed Water
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G Gas GA Gauge GAL Gallons GALV Galvanized GFU Glycol Feed Unit GPH Gallons per Hour GPM Gallons Per Minute GR Grade GUI Graphical User Interface
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HB Hose Bib (Connection) HCFC Hydrochlorocfuorocarbon HD Hot Deck HDD Heating Degree Days HEPA High Efficiency Particulate Arresting HFC HydroFluoroCarbon HHV Higher Heating Value HHWP Heating Hot Water Pump HHWR Heating Hot Water Return HHWS Heating Hot Water Supply HL High Limit HP Horsepower or High Point HPS High Pressure Steam HR Heat Recovery HRU Heat Recovery Unit HRV Heat Recovery Ventilator HSPF Heating Seasonal Performance Factor HTG Heating HVAC Heating Ventilation and Air Conditioning HWP Hot Water Pump HWR Hot Water Return HWRT Hot Water Return Temperature HWS Hot Water Supply HWST Hot Water Supply Temperature HX Heat Exchanger HZ Hertz (Cycles per Second)
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I/O Input Output IAQ Indoor Air Quality ID Inside Diameter IN Inches IPMVP International Performance Measurement and Verification Protocol IR Infra-Red
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LAT Leaving Air Temperature LB Pound LD Linear Diffuser LF Linear Feet LHV Lower Heating Value LL Low Limit LON Local Operating Network LP Low Pressure LPS Low Pressure Steam LRA Locked Rotor Amps LUVR or LVR Louver LVDR Louvered Door LVG Leaving LWBT Leaving Wet Bulb Temperature LWT Leaving Water Temperature
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M&V Measurement and Verification MA Mixed Air MAT Mixed Air Temperature MAX Maximum MBH 1000 BTUH MCA Minimum Circuit Amps MCC Motor Control Center MD Motorized Damper MECH Mechanical MIN Minimum MU Make-Up Water MUA Make-up Air Unit MX Metrix Utility Accounting System MZ Multi-Zone
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NC Normally Closed NEMA National Electrical Manufacturers Association NO Normally Open NOM Nominal NPSH Net Positive Suction Head
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OA Outside Air OAI Outside Air Intake OAP Outside Air Percentage OAT Outside Air Temperature OC On Center OD Outside Diameter ODP Open Drip Proof OV Outlet Velocity OWS Operator Work Station
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PC Performance Contracting PCF Pounds per Cubic Foot PD Pressure Drop PE Professional Engineer PH Pre-Heat PID Proportional Integral Derivative PRV Pressure Relief Valve PSI Pounds per Square Inch PSIA Pounds per Square Inch – Absolute PSID Pounds per Square Inch – Differential PSIG Pounds per Square Inch – Gauge PTAC Packaged Terminal Air Conditioner PVC Polyvinyl Chloride
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R Radius RA Return Air RET Return RF Return Fan RH Reheat RLA Running Load Amps RLF Relief RPM Revolutions Per Minute RTD Resistance Temperature Detector RTU Roof Top Unit
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SA Supply Air SAT Supply Air Temperature SC Shading Coefficient SCR Screen SCT Saturated Condensing Temperature SD Smoke Detector or Smoke Damper SE Smoke Exhaust SEER Seasonal Energy Efficiency Ratio SEN Sensible SF Supply Fan SFD Combination Smoke / Fire Damper SHC Sensible Heat Capacity SHFG Solar Heat Gain Factor SHR Sensible Heat Ratio SP Set Point SS Stainless Steel SUP Supply SWP Steam Working Pressure
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T Temperature TEFC Totally Enclosed Fan Cooled TEMP Temperature TEV Thermostatic Expansion Valve TOD Time Of Day TON 12,000 BTUH (Cooling Capacity) TORR Millimeter of Mercury (mmHg) TSP Total Static Pressure TSTAT Thermostat TXV Thermostatic Expansion Valve TYP Typical
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UC Undercut (Door) UH Unit Heater UV UltraViolet
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V Volts VAV Variable Air Volume VD Volume Damper VEL Velocity VFD Variable Frequency Drive VSD Variable Speed Drive VSP Variable Speed Pump(ing)
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WB Wet Bulb WC Water Column WG Water Gauge WPD Water Pressure Drop WTD Water Temperature Difference
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