2,400+ Definitions

HVAC GLOSSARY

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

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Control Board
A control board is the central electronic component that manages…
Control Calibration
Control calibration involves adjusting thermostat and building management system settings…
Control Damper
A control damper is an automatic or modulating damper controlled…
Control Diagram
A Control Diagram is a detailed schematic illustrating all sensors,…
Control Narrative
A Control Narrative is a written description of how a…
Control System Design
Control System Design specifies the hardware, software, and logic sequences…
Control Transformer
A control transformer is a step-down transformer that reduces line…
Control Valve
A Control Valve is an actuated device that modulates fluid…
Controlled Environment
A controlled environment is a space where temperature, humidity, air…
Convection
Convection is the transfer of thermal energy through the movement…
Convector
A convector is a heating device that transfers warmth from…
Cool Roof
A cool roof is a roofing system with high solar…
Cooling Coil
A cooling coil is a heat exchanger that removes thermal…
Cooling Load
Cooling load is the rate at which heat must be…
Cooling Load Calculation
Cooling load calculation determines the total heat removal capacity (in…
Cooling Seasonal Performance Factor
Cooling Seasonal Performance Factor (CSPF) measures the total cooling output…
Cooling Tower
A cooling tower is a heat rejection device that transfers…
Cooling Tower Blowdown
Blowdown is the controlled release of concentrated circulating water from…
Cooling Tower Chemical Treatment
Cooling tower chemical treatment involves adding specialized biocides, corrosion inhibitors,…
Cooling Tower Efficiency
Cooling tower efficiency measures how effectively a tower removes heat…
Cooling Tower Makeup Water
Makeup water is fresh water added to the cooling tower…
COP
COP (Coefficient of Performance) measures the ratio of heat output…
COP (Coefficient of Performance)
Coefficient of Performance (COP) measures the efficiency of a heat…
Copper Pipe
Copper pipe is a rigid or semi-rigid tubing made from…
Counter Flow Heat Exchanger
A counter flow heat exchanger operates with fluids moving in…
Counterflow Tower
A counterflow cooling tower directs air vertically upward while water…
CPVC Pipe
CPVC (chlorinated polyvinyl chloride) pipe is a rigid plastic tubing…
CRAC Unit
A Computer Room Air Conditioner (CRAC) unit is a close-control…
Crankcase Heater
A crankcase heater is a small electrical resistance heating element…
Crawl Space Encapsulation
Crawl space encapsulation is the process of sealing and conditioning…
Cross Flow Heat Exchanger
A cross flow heat exchanger has fluids moving perpendicular to…
Crossflow Tower
A crossflow cooling tower directs air horizontally across falling water…
CSA C22.2
CSA C22.2 is the Canadian safety standard series for electrical…
Curb
A curb is a structural frame or raised base that…
Cv Value
The Cv value is a numerical coefficient that quantifies the…
Cx Authority
The Cx Authority is the designated individual or firm responsible…