2,400+ Definitions
HVAC GLOSSARY
Every HVAC term, acronym, and industry phrase — defined in plain English.
IAQ Dashboard
An IAQ dashboard is a centralized display or software interface…
IAQ Procedure
The IAQ Procedure is a performance-based ASHRAE 62.1 compliance method…
IBC
IBC stands for International Building Code, a comprehensive model building…
Ice Machine
An ice machine is a commercial refrigeration appliance that automatically…
IECC
Definition The International Energy Conservation Code (IECC) is a model…
IECC 2015
The 2015 International Energy Conservation Code updated energy efficiency requirements…
IECC 2018
The 2018 International Energy Conservation Code (IECC) establishes minimum energy…
IECC 2021
IECC 2021 is the 2021 edition of the International Energy…
IEER
IEER (Integrated Energy Efficiency Ratio) measures air conditioning system efficiency…
Igniter
An igniter is an electrically heated ceramic element that reaches…
Ignition Control Module
An ignition control module is an advanced electronic component that…
IMC
The IMC is the International Mechanical Code, a model building…
Immersion Cooling
Immersion Cooling submerges entire servers or individual components in thermally…
In Duct Air Purifier
An in duct air purifier is an air treatment device…
In Row Cooling
In Row Cooling refers to cooling units positioned directly between…
Inches Water Column
Inches Water Column (IWC) is a unit of pressure measurement…
Inclined Manometer
An inclined manometer is a pressure measurement device with a…
Indirect Circulation System
An indirect circulation system pumps heat transfer fluid (typically antifreeze…
Indirect Fired Chiller
An indirect fired chiller uses a separate heat source, such…
Indirect Water Heater
An indirect water heater uses heat from a boiler’s heating…
Indoor Air Quality (IAQ)
Indoor Air Quality (IAQ) refers to the air quality within…
Induced Draft
Induced draft is a ventilation method where a fan or…
Induced Draft Cooling Tower
An induced draft cooling tower uses a fan mounted at…
Induction Unit
An induction unit is a type of terminal device used…
Industrial Heating
Industrial heating encompasses heating systems and equipment designed to warm…
Industrial Ventilation
Industrial ventilation systems remove contaminants, heat, humidity, and harmful substances…
Inertia Base
An inertia base is a massive concrete or steel platform…
Infiltration Rate
Infiltration rate measures the volume of uncontrolled outside air entering…
Inflation Reduction Act
The Inflation Reduction Act (IRA), enacted in August 2022, represents…
Infrared Heater
An infrared heater is an industrial heating device that produces…
Infrared Inspection
Infrared inspection identifies equipment problems and energy losses by measuring…
Infrared Thermometer
An infrared thermometer measures surface temperature by detecting thermal radiation…
Insulation Resistance Test
An insulation resistance test measures the effectiveness of electrical insulation…
Integral Control
Integral control continuously adjusts valve position based on the accumulated…
Integrated Collector Storage
Integrated collector storage (ICS) systems combine solar collection and thermal…
Integrated Design
Integrated design is a collaborative planning approach where HVAC engineers,…
Integrated Energy Efficiency Ratio
Integrated Energy Efficiency Ratio (IEER) measures the cooling efficiency of…
Integrated Part Load Value
Integrated Part Load Value (IPLV) represents chiller or air conditioning…
International Energy Conservation Code
The International Energy Conservation Code (IECC) is a model building…
Internet of Things
The Internet of Things (IoT) is a network of physical…
Inverter Efficiency
Inverter efficiency measures the percentage of DC power successfully converted…
IO List
An IO List (Input/Output List) documents all physical connections between…
IoT Sensor
An IoT Sensor is a connected device that continuously measures…
IPLV
IPLV (Integrated Part Load Value) measures chiller efficiency across varying…
IRA HVAC Rebates
IRA HVAC Rebates are federal rebate programs established under the…
IRC
Definition The International Residential Code (IRC) is a model building…
Irradiance Correction
Irradiance correction adjusts solar panel performance calculations to account for…
Isentropic Compression
Isentropic compression is a theoretical frictionless compression process where entropy…