2,400+ Definitions
HVAC GLOSSARY
Every HVAC term, acronym, and industry phrase — defined in plain English.
Ceiling Access Panel
A ceiling access panel is a removable or hinged opening…
Ceiling Diffuser
A ceiling diffuser is a supply air terminal mounted flush…
Ceiling Fan
A ceiling fan is a mechanical ventilation device mounted to…
Ceiling Fan CFM
Ceiling fan CFM is the cubic feet per minute of…
Ceiling Fan Efficiency
Ceiling fan efficiency measures how effectively a fan converts electrical…
Cellulose Insulation
Cellulose insulation is a loose-fill or blown material composed primarily…
Central Plant
A Central Plant is a centralized mechanical facility that generates…
Centrifugal Chiller
A centrifugal chiller is a type of vapor-compression refrigeration system…
CFC Refrigerant
Chlorofluorocarbons (CFCs) are a class of synthetic organic compounds composed…
CFCs and Ozone Layer
Chlorofluorocarbons (CFCs) are industrial chemicals that release chlorine atoms when…
CFM
CFM stands for Cubic Feet per Minute and measures the…
Characterized Control Valve
A characterized control valve is a modulating valve with an…
Charge Verification
Charge verification is the process of confirming that an air…
Check Valve
A check valve is a one-way mechanical valve used in…
Check Valve Plumbing
A check valve is a one-way flow device that permits…
Chemical Storage Ventilation
Chemical storage ventilation systems manage hazardous vapors and fumes from…
Chemisorption
Chemisorption is a process where gas molecules chemically bond to…
Chilled Beam
A chilled beam is a ceiling-mounted heat exchanger that uses…
Chilled Water Coil
A chilled water coil is a heat exchanger that cools…
Chilled Water Plant
A Chilled Water Plant is a centralized cooling facility that…
Chilled Water System
A chilled water system is a centralized cooling arrangement that…
Chiller
A chiller is a refrigeration system designed to cool a…
Chimney Inspection
A chimney inspection evaluates the structural integrity, cleanliness, and proper…
CHP System
A CHP System integrates power generation and heat recovery equipment…
Circuit Board
A circuit board, formally known as a Printed Circuit Board…
Circuit Breaker
A circuit breaker is an automatic switching device that protects…
Circulator Pump
A Circulator Pump is a hydronic system component that creates…
Clamp On Ammeter
A clamp on ammeter is a non-contact instrument that measures…
Clash Detection
Clash Detection is an automated process that identifies where HVAC…
Clean Room Classification
Clean room classification is a standardized system categorizing enclosed spaces…
Clean Room HVAC
Clean room HVAC systems maintain strict environmental controls including particle…
Closed Circuit Cooler
A closed circuit cooler is a heat rejection device that…
Closed System Plumbing
Closed system plumbing refers to a piping configuration where water…
Closed System Thermodynamics
A closed system has fixed boundaries that prevent mass transfer…
Clothing Insulation
Clothing insulation is the thermal resistance of garments worn by…
Cloud Connected HVAC
Cloud Connected HVAC refers to heating, ventilation, and air conditioning…
CO Detector
A CO detector is a wall-mounted or plug-in safety device…
CO Meter
A CO meter is a handheld instrument that measures carbon…
CO Monitoring Parking
CO monitoring in parking facilities uses electrochemical or infrared sensors…
CO2 Booster System
A CO2 booster system employs a parallel compressor configuration where…
CO2 Monitor
A CO2 monitor measures carbon dioxide concentration in indoor air,…
CO2 Refrigeration
CO2 refrigeration uses carbon dioxide (R-744) as the working fluid…
CO2 Sensor
A CO2 sensor measures carbon dioxide concentration in indoor air,…
Coefficient of Performance Refrigeration
Coefficient of Performance (COP) for refrigeration is the ratio of…
Cogeneration
Cogeneration is a process that simultaneously produces electricity and useful…
Coil Cleaner Chemical
Coil Cleaner Chemical is a formulated solution designed to dissolve…
Coil Cleaning
Coil cleaning is the process of removing accumulated dirt, scale,…
Coil Cleaning Procedure
Coil Cleaning Procedure is the systematic process of removing dirt,…