2,400+ Definitions
HVAC GLOSSARY
Every HVAC term, acronym, and industry phrase — defined in plain English.
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…
Halide Torch
A halide torch is a flame-based leak detection tool that…
Hard Start
A hard start kit is an electrical device that provides…
Hard Start Kit
A hard start kit is a capacitor assembly that provides…
Harmonic Distortion
Harmonic distortion is the presence of electrical frequencies at multiples…
Hazen Williams
The Hazen-Williams equation is an empirical formula used to calculate…
HCFC Refrigerant
HCFC refrigerants (hydrochlorofluorocarbons) are transitional compounds containing hydrogen, chlorine, fluorine,…
Heat
Heat is the transfer of thermal energy between systems, objects,…
Heat Anticipator
A heat anticipator is a small, adjustable resistive device located…
Heat Capacity
Heat capacity is the amount of thermal energy required to…
Heat Engine
A heat engine is a device that converts thermal energy…
Heat Exchanger
The heat exchanger in a gas furnace is the component…
Heat Exchanger Inspection
A heat exchanger inspection examines the furnace or air handler…
Heat Flux
Heat flux is the rate of heat energy transfer per…
Heat Load
Heat load (also called heating load or heat loss) is…
Heat Pipe
A heat pipe is a sealed copper or aluminum tube…
Heat Pump
A heat pump is an HVAC system that moves heat…
Heat Pump Installation
Heat pump installation is the process of mounting and connecting…
Heat Pump Thermostat
A heat pump thermostat is specifically designed to manage heat…
Heat Pump Water Heater
A heat pump water heater (HPWH) uses electricity and refrigerant-based…
Heat Recovery
Heat recovery systems capture thermal energy from exhaust air, wastewater,…
Heat Recovery Chiller
A heat recovery chiller is a refrigeration system engineered to…
Heat Recovery Ventilation
Heat Recovery Ventilation (HRV) transfers thermal energy from exhaust air…
Heat Transfer
Heat transfer is the movement of thermal energy from a…
Heating Coil
A heating coil is a heat exchanger that raises the…
Heating Load Calculation
Heating load calculation determines the heat input (in BTU/h or…
Heating Seasonal Performance Factor
Heating Seasonal Performance Factor (HSPF) measures the total heating output…