2,400+ Definitions
HVAC GLOSSARY
Every HVAC term, acronym, and industry phrase — defined in plain English.
Chilled Water Plant
A Chilled Water Plant is a centralized cooling facility that…
Chilled Water Reset
A control strategy that raises the chilled water supply temperature…
Chilled Water System
A chilled water system is a centralized cooling arrangement that…
Chiller
A chiller is a refrigeration system designed to cool a…
Chiller Sequencing
The control strategy that determines when additional chillers in 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 Balancing Valve
An adjustable valve installed on each hydronic circuit to restrict…
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…
Clam Shell Heat Exchanger
A traditional residential gas furnace heat exchanger design consisting of…
Clamp On Ammeter
A clamp on ammeter is a non-contact instrument that measures…
Clamp-On Ammeter
An electrical test instrument with a jaw that clamps around…
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…
Clear-Field U-Factor
The thermal transmittance of a fenestration unit measured at the…
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…
Closely Spaced Tees
A pair of tees installed on a common pipe with…
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 Analyzer
A portable gas detector calibrated specifically to measure carbon monoxide…
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,…
CO2-Based DCV
A form of demand control ventilation that uses carbon dioxide…
Coanda Effect
The tendency of a moving air jet to attach to…
Coefficient of Performance
A dimensionless ratio expressing the heat output or heat removal…
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 Circuiting
The internal arrangement of refrigerant or water passes within an…
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,…
Coil Coating
Coil coating is a protective layer applied to heat exchanger…
Coil Face Velocity
Coil face velocity is the linear speed (measured in feet…
Coil Fin Straightener
A coil fin straightener is a hand tool used to…
Coil Fouling Factor
The coil fouling factor is a dimensionless value representing the…
Coil Freeze
Coil freeze occurs when evaporator temperature drops below 32 degrees…
Coil Frosting Pattern
The visual distribution of frost accumulation across an evaporator coil…
Coil Rows
Coil rows refer to the number of horizontal layers of…