2,400+ Definitions
HVAC GLOSSARY
Every HVAC term, acronym, and industry phrase — defined in plain English.
Refrigerant Charge
Refrigerant charge refers to the specific amount of refrigerant in…
Refrigerant Leak Detection
Refrigerant leak detection is the process of locating refrigerant leaks…
Refrigerant Recovery
Refrigerant recovery is the mandatory process of removing refrigerant from…
Refrigeration Cycle
The refrigeration cycle is the thermodynamic process by which HVAC…
Scroll Compressor
A scroll compressor uses two interleaved spiral-shaped scrolls to compress…
Seasonal Energy Efficiency Ratio (SEER)
SEER (Seasonal Energy Efficiency Ratio) was the primary efficiency rating…
SEER2
Seasonal Energy Efficiency Ratio 2 (SEER2) is the updated federal…
Subcooling
Subcooling is the temperature decrease of a liquid refrigerant below…
Superheat
Superheat is the temperature increase of a vapor above its…
Thermostat
A thermostat is the control device that monitors indoor temperature…
Ton (HVAC)
In HVAC, a ton is a unit of cooling capacity…
TXV (Thermostatic Expansion Valve)
A Thermostatic Expansion Valve (TXV, also TEV) is a refrigerant…
Variable Frequency Drive (VFD)
A Variable Frequency Drive (VFD) is an electronic controller that…
Variable Speed Motor
A variable speed motor (also called an ECM — Electronically…
VRF System
VRF (Variable Refrigerant Flow) is a sophisticated HVAC technology used…
Zoning System
An HVAC zoning system divides a building into multiple independently…