2,400+ Definitions
HVAC GLOSSARY
Every HVAC term, acronym, and industry phrase — defined in plain English.
Energy Audit
An energy audit is a systematic evaluation of building energy…
Energy Benchmark
Energy benchmarking is the process of measuring a building’s energy…
Energy Code
Energy codes are mandatory building standards that establish minimum efficiency…
Energy Conservation Measure
An Energy Conservation Measure (ECM) is any specific action, equipment…
Energy Cost Budget
An Energy Cost Budget is a financial projection that estimates…
Energy Efficiency Program
An Energy Efficiency Program is a structured utility or government…
Energy Efficiency Ratio
Energy Efficiency Ratio (EER) measures air conditioning cooling output in…
Energy Efficient Mortgage
An Energy Efficient Mortgage (EEM) is a home loan that…
Energy Factor
Energy Factor (EF) was the primary efficiency metric for water…
Energy Gateway
An energy gateway is a central hub device that collects…
Energy Management System
An energy management system (EMS) is a networked software platform…
Energy Modeling
Energy modeling is the computer-based simulation of building energy consumption…
Energy Monitoring App
An energy monitoring app displays real-time and historical heating and…
Energy Recovery Ventilation
Energy Recovery Ventilation (ERV) transfers both sensible heat and latent…
Energy Recovery Ventilator
A mechanical ventilation device that transfers both heat and moisture…
ENERGY STAR
ENERGY STAR is a certification program run by the U.S.…
ENERGY STAR Certified
ENERGY STAR Certified indicates that an HVAC or solar product…
ENERGY STAR Fan
An ENERGY STAR Fan is a ventilation or circulation fan…
ENERGY STAR HVAC
The EPA ENERGY STAR program for HVAC equipment establishes minimum…
ENERGY STAR Most Efficient
ENERGY STAR Most Efficient represents the highest tier of ENERGY…
ENERGY STAR Version
ENERGY STAR Version refers to the specific generation or iteration…
Energy Storage System
An energy storage system captures and stores electrical energy for…
Energy Use Intensity
Energy Use Intensity (EUI) measures the total annual energy consumption…
EnergyPlus
EnergyPlus is a free, open-source whole-building energy simulation engine developed…
Enthalpy
Enthalpy is the total heat content of a substance, representing…
Enthalpy Control
Enthalpy control is an economizer strategy that compares the total…
Enthalpy Wheel
An enthalpy wheel is a rotating heat and moisture exchange…
Entropy
Entropy is a measure of disorder or randomness in a…
Envelope Airtightness
A measured property of a building’s enclosure describing how much…
EPA 410
EPA 410 refers to the refrigerant handling certification program established…
EPA 608
EPA 608 is the federal certification examination required for technicians…
EPA 608 Certification
EPA Section 608 Certification is the federal certification required by…
EPA 608 Type I
One of the four certification categories under EPA Section 608…
EPA 608 Type II
An EPA Section 608 certification category for technicians who service,…
EPA 608 Type III
An EPA Section 608 certification category for technicians working on…
EPA 608 Universal
The highest level of EPA Section 608 certification indicating that…
EPA 609
EPA 609 refers to Section 609 of the Clean Air…
EPA Section 608
The refrigerant management regulations under Section 608 of the Clean…
EPA SNAP
EPA SNAP (Significant New Alternatives Policy) is the Environmental Protection…
Equal Friction Method
The equal friction method is a standardized ductwork design technique…
Equal Percentage Valve
An equal percentage valve is a characterized control valve where…
Equal-Friction Method
A duct sizing procedure in which each section of ductwork…
eQUEST
eQUEST is a graphical interface for DOE 2 that simplifies…
Equilibrium
Equilibrium represents a state where all thermodynamic properties remain unchanged…
Equipment Clearance
Equipment clearance refers to the minimum required space surrounding HVAC…
Equipment Health Monitoring
Equipment health monitoring continuously tracks the operational status and performance…
Equipment Installation
Equipment installation refers to the placement and connection of major…
Equipment Pad
An equipment pad is a concrete or structural foundation designed…