2,400+ Definitions
HVAC GLOSSARY
Every HVAC term, acronym, and industry phrase — defined in plain English.
Heat Pipe
A heat pipe is a sealed copper or aluminum tube…
Heat Pipe Heat Exchanger
A passive heat recovery device that uses sealed tubes containing…
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 VRF
A two-pipe VRF system configuration in which all indoor units…
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 Recovery Ventilator
A ventilation unit that recovers sensible heat from exhaust air…
Heat Recovery VRF
A VRF system configuration using a three-pipe refrigerant circuit that…
Heat Transfer
Heat transfer is the movement of thermal energy from a…
Heat Transfer Plate
A stamped aluminum plate with a channel designed to snap…
Heated Diode Leak Detector
A type of refrigerant leak detector that passes sampled air…
Heated Diode Sensor
A leak detector sensing element that passes refrigerant-containing air over…
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…
HEEHRA
HEEHRA stands for Home Energy Efficiency Retrofit and Rebate Act,…
HEMS
HEMS stands for Home Energy Management System, an integrated platform…
HEPA Air Purifier
HEPA air purifiers are standalone or integrated units using High-Efficiency…
HEPA Filter
A HEPA filter is a high-efficiency particulate air filter that…
HEPA Filtered Room
A HEPA filtered room uses High-Efficiency Particulate Air filters to…
HFC Development
Hydrofluorocarbons (HFCs) were developed in the 1990s as replacements for…
HFC Phase Down
The HFC Phase Down is a scheduled reduction in hydrochlorofluorocarbon…
HFC Phasedown Schedule
The HFC Phasedown Schedule is a federally mandated program that…
HFC Refrigerant
HFC refrigerants (hydrofluorocarbons) are synthetic compounds containing hydrogen, fluorine, and…
HFO Refrigerant
HFO refrigerants (hydrofluoroolefins) are third-generation synthetic refrigerants containing hydrogen, fluorine,…
High Efficiency Electric Home Rebate
The High Efficiency Electric Home Rebate is a federal incentive…
High Efficiency Furnace
A high-efficiency furnace is a condensing heating system that achieves…
High Pressure Category
The High Pressure Category covers air conditioning and refrigeration systems…
High Pressure Switch
A high pressure switch is a safety control device installed…
High Superheat
High superheat occurs when refrigerant temperature exceeds the saturation temperature…
High Temperature Cascade
The high temperature cascade stage is the upper circuit in…
High Velocity System
A high velocity system is a type of HVAC system…
High-Side Gauge
The pressure gauge on a manifold set connected to the…
Hipot Test
A hipot test, or high potential test, applies a high…
Historian
A Historian is specialized software that stores, retrieves, and analyzes…
Holding Capacity
Holding capacity is the maximum heat load that a refrigeration…
Holiday Schedule
Holiday Schedule is a programmed control setting that automatically suspends…
Home Assistant HVAC
Home Assistant HVAC refers to heating, ventilation, and air conditioning…
Home Automation
Home Automation refers to the integration of electrical systems and…
Home Battery System
A home battery system stores electrical energy generated by solar…
Home Mode
Home mode is the default HVAC operating schedule that maintains…
HOMES Rebate Program
The HOMES Rebate Program provides federal incentives for residential energy…
Horizontal Loop Field
A geothermal ground heat exchanger where piping is buried in…
Hospital HVAC
Hospital HVAC systems provide infection control, humidity management, and reliable…