2,400+ Definitions

HVAC GLOSSARY

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

All A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
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…
Hot Aisle Containment
Hot aisle containment isolates warm return air from server equipment…
Hot Gas Bypass
A hot gas bypass is a refrigeration control method that…
Hot Gas Bypass Valve
A pressure-regulating valve that diverts discharge gas back into the…
Hot Gas Defrost
A defrost method used in heat pump outdoor units where…
Hot Gas Defrost Solenoid
An electrically actuated valve that opens during the defrost cycle…
Hot Gas Line
The hot gas line, also known as the discharge line,…
Hot Gas Reheat
Hot Gas Reheat (HGRH) is a dehumidification strategy used in…
Hot Surface Igniter
A hot surface igniter is an electric heating element that…
Hot Water Coil
A hot water coil is a heating heat exchanger that…
Hot Water Plant
A Hot Water Plant is a centralized heating facility that…
Hot Water Recirculation Pump
A hot water recirculation pump continuously circulates heated water through…
Hot Wire
The hot wire carries electrical current from the source to…
Hot Wire Anemometer
A hot wire anemometer measures air velocity by detecting cooling…
Hot-Wire Anemometer
A velocity measurement instrument that senses airflow by the convective…
Hourly Analysis Program
Hourly Analysis Program (HAP) is an energy simulation methodology and…
Housewrap
Housewrap is a weather-resistant membrane installed over building sheathing to…
HRV (Heat Recovery Ventilator)
A Heat Recovery Ventilator (HRV) provides controlled fresh air ventilation…
HSPF
HSPF (Heating Seasonal Performance Factor) measures the total heating output…
HSPF2
HSPF2 (Heating Seasonal Performance Factor 2) is the federal standard…
Humidifier
A humidifier is an HVAC component designed to increase the…
Humidifier (Whole-House)
A whole-house humidifier adds moisture to the air distributed through…
Humidistat
A humidistat is a control device that measures indoor relative…
Humidity
Humidity is the amount of water vapor present in the…
Humidity Data Logger
A humidity data logger continuously records relative humidity (RH) levels…
Humidity Effectiveness
A performance metric for heat and energy recovery ventilators expressing…
Humidity Ratio
The mass of water vapor present in a unit mass…
Humidity Sensor
A humidity sensor detects and measures moisture content in air,…
HVAC API
An HVAC API is an application programming interface that enables…
HVAC App
An HVAC app is a mobile application that enables users…
HVAC Coordination
HVAC Coordination is the collaborative process of aligning heating, ventilation,…
HVAC Diagnostics Remote
HVAC diagnostics remote refers to the ability to perform system…