2,400+ Definitions
HVAC GLOSSARY
Every HVAC term, acronym, and industry phrase — defined in plain English.
Walk In Cooler
A walk-in cooler is a large, insulated refrigerated room that…
Walk In Freezer
A walk-in freezer is an insulated, temperature-controlled room that maintains…
Wall Furnace
A wall furnace is a self-contained, vented heating appliance designed…
Wall Insulation
Wall insulation refers to materials installed within wall cavities, externally,…
Wall Sleeve
A wall sleeve is a metal or plastic tube installed…
Washable Filter
Washable filters feature synthetic media materials that withstand repeated water…
Washington Energy Code
The Washington State Energy Code (WSEC) establishes mandatory efficiency standards…
Water Boiler
A water boiler is a closed vessel designed to heat…
Water Cooled Condenser
A water-cooled condenser is a heat exchanger that rejects refrigerant…
Water Hammer
Water hammer is a sudden pressure spike in a pipe…
Water Hammer Arrestor
A water hammer arrestor is a small cylindrical device containing…
Water Heater
A water heater is an appliance that raises the temperature…
Water Heater Anode Rod
An anode rod is a sacrificial metal rod installed inside…
Water Heater Burner
A water heater burner is the combustion component in gas…
Water Heater Capacity
Water heater capacity refers to the volume of hot water…
Water Heater Efficiency
Water heater efficiency measures how effectively the unit converts fuel…
Water Heater Element
A water heater element is an electric heating component that…
Water Heater Expansion Tank
A water heater expansion tank is a small pressurized vessel…
Water Heater Flush
A water heater flush is a maintenance procedure that drains…
Water Heater Recovery Rate
Water heater recovery rate measures how quickly a water heater…
Water Heater Thermostat
A water heater thermostat is a temperature-sensing device that controls…
Water Source Heat Pump
A water source heat pump (WSHP) is a type of…
Water Treatment
Water treatment in HVAC systems involves the chemical conditioning and…
Water Treatment Program
A water treatment program is a comprehensive maintenance and chemical…
Watt
A watt (W) is the unit of electrical power representing…
Watt Hour
A watt-hour (Wh) is a unit of electrical energy equal…
Weatherization
Weatherization is the process of sealing air leaks, adding insulation,…
Welded Duct
Welded duct is HVAC ductwork fabricated with seams permanently joined…
WELL Building Standard
The WELL Building Standard is a performance-based certification system developed…
Wet Bulb Temperature
Wet bulb temperature is the lowest temperature air can reach…
White Roof
A white roof features a highly reflective coating or membrane…
Whole Building Energy Simulation
Whole Building Energy Simulation is a computer-based modeling process that…
Whole Building Retrofit
A whole building retrofit is a comprehensive upgrade of an…
Whole House Air Purifier
A whole house air purifier is an integrated system installed…
Whole House Fan
A whole house fan is a high-capacity ventilation system that…
Whole House Water Heater
A whole house water heater is a centralized system that…
WiFi HVAC
WiFi HVAC systems connect thermostats, smart vents, and air quality…
WiFi Thermostat
A WiFi thermostat is a internet-connected control device that allows…
Willis Carrier
Willis Haviland Carrier (1876-1950) invented the first practical electric air…
Window AC Installation
Window AC installation involves securing a self-contained cooling unit into…
Window Air Conditioner
A window air conditioner is a self-contained cooling system designed…
Window Film
Window film is a thin polyester or PET-based coating applied…
Window Sensor HVAC
A window sensor HVAC device detects whether windows are open…
Window U Factor
Window U Factor measures the rate of heat transfer through…
Winter Design Temperature
Winter design temperature is the minimum outdoor air temperature expected…
Wire Gauge
Wire gauge measures the diameter and cross-sectional area of electrical…
Wire Mesh Screen
A wire mesh screen is a woven or welded grid…
Wireless Sensor
A wireless sensor is a battery-powered or hardwired temperature and…