2,400+ Definitions
HVAC GLOSSARY
Every HVAC term, acronym, and industry phrase — defined in plain English.
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,…
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 Rows
Coil rows refer to the number of horizontal layers of…
Coincident Peak
Coincident peak refers to the maximum simultaneous electrical demand or…
Cold Aisle Containment
Cold aisle containment encloses the front of server racks to…
Cold Plasma
Cold plasma is an ionization technology that generates activated ions…
Cold Room
A cold room is an insulated, walk-in refrigerated space maintained…
Combi Boiler
A combi boiler is a single, compact unit that provides…
Combined Energy Efficiency Ratio
Combined Energy Efficiency Ratio (CEER) measures the cooling efficiency of…
Combined Heat and Power
Combined Heat and Power (CHP) refers to energy systems that…
Combustion Air
Combustion air is the oxygen-containing air required for the chemical…
Combustion Analysis
Combustion analysis is the process of measuring the byproducts of…
Combustion Analyzer
A combustion analyzer is an electronic instrument that measures exhaust…
Combustion Chamber
The combustion chamber is the enclosed space within a furnace…
Combustion Inspection
A combustion inspection analyzes gas furnace combustion efficiency by measuring…