2,400+ Definitions
HVAC GLOSSARY
Every HVAC term, acronym, and industry phrase — defined in plain English.
Radiant Tube Heater
A radiant tube heater is an industrial heating system consisting…
Radiation
Radiation is heat transfer through electromagnetic waves that requires no…
Radon
Radon is a colorless, odorless, radioactive gas that seeps into…
Range Hood
A range hood is an exhaust ventilation system installed above…
Range Temperature
Range temperature is the difference between the hot water entering…
Rankine Cycle
The Rankine cycle is a thermodynamic process describing how steam…
RC Curve
An RC curve is an alternative noise rating system that…
Reach Code
A Reach Code is a local or regional energy code…
Reach In Cooler
A reach-in cooler is a self-contained refrigeration unit with front-opening…
Reactive Power
Reactive power is the portion of electrical power that oscillates…
Real Power
Real power is the actual electrical power consumed by HVAC…
Real Time Pricing
Real time pricing (RTP) is a utility billing model where…
Rear Door Heat Exchanger
A Rear Door Heat Exchanger is a cooling device mounted…
Rebate Program
Rebate programs are incentive offerings from utilities, government agencies, and…
REC
REC is the abbreviation for Renewable Energy Certificate, a tradable…
Receiver
A receiver is a cylindrical pressure vessel installed in the…
Recirculation System
A recirculation system continuously circulates hot water through supply lines…
Rectangular Duct
Rectangular duct is a type of HVAC ductwork defined by…
Refrigerant
Refrigerant is the working fluid in an HVAC or refrigeration…
Refrigerant Blend
A refrigerant blend is a mixture of two or more…
Refrigerant Brazing
Refrigerant brazing is the process of joining copper tubing using…
Refrigerant Charge
Refrigerant charge refers to the specific amount of refrigerant in…
Refrigerant Charging
Refrigerant charging is the process of adding the correct amount…
Refrigerant Cylinder
A refrigerant cylinder is a pressurized metal container specifically designed…
Refrigerant Detector Alarm
A refrigerant detector alarm is a safety device that continuously…
Refrigerant Distributor
A refrigerant distributor is a device installed between an expansion…
Refrigerant GWP
Refrigerant GWP (Global Warming Potential) is a numerical rating measuring…
Refrigerant Leak
A refrigerant leak occurs when the sealed cooling system loses…
Refrigerant Leak Check Annual
An annual refrigerant leak check is a professional inspection using…
Refrigerant Leak Detection
Refrigerant leak detection is the process of locating refrigerant leaks…
Refrigerant Leak Sensor
A refrigerant leak sensor detects and alerts operators to the…
Refrigerant Line Set
A refrigerant line set is a pair or trio of…
Refrigerant Log
A Refrigerant Log is a detailed record documenting all refrigerant…
Refrigerant Management Plan
A Refrigerant Management Plan is a documented strategy that outlines…
Refrigerant ODP
Refrigerant ODP (Ozone Depletion Potential) is a relative measure of…
Refrigerant Pressure Check
A refrigerant pressure check measures high-side and low-side pressures in…
Refrigerant Purchase Record
A Refrigerant Purchase Record is documentation of all refrigerant acquisition…
Refrigerant Reclaim
Refrigerant reclaim is the industrial process of purifying used refrigerant…
Refrigerant Reclaiming
Refrigerant reclaiming is the process of reprocessing used or contaminated…
Refrigerant Recovery
Refrigerant recovery is the mandatory process of removing refrigerant from…
Refrigerant Recovery Cylinder
A refrigerant recovery cylinder is a specialized pressurized container designed…
Refrigerant Recycling
Refrigerant recycling is the process of cleaning used refrigerant extracted…
Refrigerant Safety Classification
Refrigerant Safety Classification is a standardized labeling system established by…
Refrigerant Tracking
Refrigerant Tracking is the systematic monitoring and documentation of refrigerant…
Refrigerant Weigh In
Refrigerant weigh in is the process of accurately measuring and…
Refrigeration Capacity
Refrigeration capacity is the maximum amount of heat that a…
Refrigeration Cycle
The refrigeration cycle is the thermodynamic process by which HVAC…
Refrigeration Cycle Efficiency
Refrigeration cycle efficiency measures how effectively a refrigeration system converts…