2,400+ Definitions

HVAC GLOSSARY

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

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Trigeneration
Trigeneration is an advanced energy system that simultaneously produces electricity,…
Trim and Respond
Trim and Respond is a control strategy that optimizes chiller…
Trim and Respond Logic
A supervisory control algorithm used in variable-flow systems where a…
Triple Evacuation
Triple evacuation is an advanced evacuation method that removes moisture…
True RMS Meter
A True RMS (Root Mean Square) meter accurately measures electrical…
Tube Spacing
The center-to-center distance between adjacent tubing runs in a radiant…
Tubular Heat Exchanger
A heat exchanger design using round or oval tubes through…
Tunnel Ventilation
Tunnel ventilation systems remove vehicle exhaust, smoke, and hazardous gases…
Turbulent Airflow
Turbulent airflow consists of random, non-directional air movement created by…
Turndown Ratio
The ratio of maximum to minimum firing rate at which…
Turning Vane
A turning vane is an internal curved or angled blade…
TVOC
TVOC represents the total mass concentration of volatile organic compounds…
Twin Rotary Compressor
A compressor type using two offset rotary elements on a…
Two Phase Immersion
Two Phase Immersion Cooling uses dielectric fluids that boil at…
Two Pipe System
A two-pipe system is a hydronic HVAC distribution configuration that…
Two Stage Furnace
A two-stage furnace is a gas-fired heating appliance equipped with…
Two Way Valve
A two-way valve has one inlet and one outlet port,…
Two-Pipe Changeover System
A hydronic distribution system that uses a single pair of…
Two-Position Control
The simplest control mode, in which an output device such…
Two-Stage Vacuum Pump
A vacuum pump with two compression stages in series that…
TXV
A thermostatic expansion valve (TXV) is a precision refrigerant metering…
TXV (Thermostatic Expansion Valve)
A Thermostatic Expansion Valve (TXV, also TEV) is a refrigerant…
Type B Vent
Type B vent is a double-wall metal pipe designed for…
Type I Certification
Type I Certification authorizes technicians to service small appliances containing…
Type I Hood
A Type I hood is a grease-capturing exhaust hood specifically…
Type II Certification
Type II Certification authorizes technicians to service large appliances and…
Type II Hood
A Type II hood is a ventilation hood designed for…
Type III Certification
Type III Certification authorizes technicians to service high-pressure air conditioning…
Typical Meteorological Year
Typical Meteorological Year (TMY) represents a complete 12-month weather dataset…