2,400+ Definitions

HVAC GLOSSARY

Every HVAC term, acronym, and industry phrase — defined in plain English.

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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…