2,400+ Definitions
HVAC GLOSSARY
Every HVAC term, acronym, and industry phrase — defined in plain English.
Galvanized Pipe
Galvanized pipe is steel tubing coated with a protective zinc…
Gas Furnace
A gas furnace is a heating appliance that burns natural…
Gas Phase Filtration
Gas phase filtration is a specialized air treatment process that…
Gas Valve
A gas valve is an electronically controlled device that regulates…
Gas Water Heater
A gas water heater uses natural gas or propane fuel…
Gate Valve
A gate valve is a linear flow control device that…
Gate Valve Plumbing
A gate valve is a shutoff valve that uses a…
Geofencing HVAC
Geofencing HVAC is a location-based control technology that uses smartphone…
Geothermal Heat Pump
A geothermal heat pump (GHP), also called a ground-source heat…
Geothermal Installation
Geothermal installation involves drilling ground loops and connecting them to…
Germicidal UV
Germicidal UV (ultraviolet-C light at 254 nanometers wavelength) destroys microorganism…
GFCI
GFCI stands for Ground Fault Circuit Interrupter, a critical safety…
Gigawatt
A gigawatt (GW) is a unit of power equal to…
Global Warming Potential Limit
A Global Warming Potential (GWP) Limit is a regulatory threshold…
Globe Valve
A Globe Valve is a linear-motion shutoff valve with an…
Glycol
Glycol is an organic antifreeze and heat transfer fluid used…
Glycol Chiller
A glycol chiller is a refrigeration system that circulates a…
Glycol Runaround
A glycol runaround system circulates a water-glycol mixture through two…
Google Home HVAC
Google Home HVAC enables control of heating and cooling systems…
GPM
GPM stands for gallons per minute, a measurement of fluid…
Grains of Moisture
Grains of moisture measure the absolute humidity content in air,…
Gravity Damper
A gravity damper is a passive, motorless damper that uses…
Grease Duct
A grease duct is the ductwork component of a kitchen…
Grease Filter
A grease filter is a mechanical component installed in Type…
Green Button Data
Green Button Data is a standardized format for downloading energy…
Green Globes
Green Globes is a web-based building environmental design and management…
Green Mortgage
A green mortgage is a specialized home loan that recognizes…
Green Power Purchase
A Green Power Purchase is the acquisition of electricity from…
Green Roof
A green roof is a vegetated roofing system where living…
Grid Defection
Grid defection occurs when customers disconnect from the utility grid…
Grid Frequency
Grid frequency is the rate at which alternating current (AC)…
Grid Interactive
Grid-interactive HVAC systems communicate with the electricity grid to optimize…
Grid Interactive HVAC
Grid Interactive HVAC systems are smart heating and cooling units…
Grid Stability
Grid stability refers to the electrical grid’s ability to maintain…
Grid Tie Inverter
A grid tie inverter converts DC power from solar panels…
Grid Tied System
A grid-tied solar system connects directly to the utility grid…
Grid Voltage
Grid voltage is the electrical potential difference maintained throughout the…
Ground Fault Circuit Interrupter
A Ground Fault Circuit Interrupter (GFCI) is a specialized electrical…
Ground Mount Solar
Ground mount solar systems position photovoltaic panels on metal or…
Ground Source Heat Pump
A Ground Source Heat Pump (GSHP), also known as a…
Ground Wire
The ground wire provides a safety path for electrical current…
GW
A gigawatt (GW) equals one billion watts or 1,000 megawatts,…
GWP 150
GWP 150 refers to refrigerants with a Global Warming Potential…
GWP 700
GWP 700 represents refrigerants with a Global Warming Potential of…
GWP 750
GWP 750 is a regulatory threshold that limits refrigerant global…