HVAC Pro Glossary

Welcome to our HVAC PRO ZONE Glossary.

Here you will find a collection of essential terms and acronyms related to Heating, Ventilation, and Air Conditioning systems to help you better understand and navigate the world of HVAC.

AC: Air Conditioning
AHU: Air Handling Unit
AFUE: Annual Fuel Utilization Efficiency
Air Handler: Circulates and conditions air in HVAC systems.

Balance Point: Outdoor temperature at which a heat pump’s output equals its heat loss.
Bioaerosols: Airborne particles of living organisms.
BTU: British Thermal Unit

Coil: Transfers heat between the indoor and outdoor units.
Compressor: Device that compresses refrigerant to remove heat from the air.
COP: Coefficient of Performance

Damper: Controls airflow in ducts.
Dehumidifier: Reduces humidity in the air.
Ductwork: System of ducts used to distribute conditioned air.

Economizer: Allows outdoor air to cool a building’s interior when conditions are favorable.
EER: Energy Efficiency Ratio
ERV: Energy Recovery Ventilator
Evaporator: Part of an AC unit that absorbs heat and turns refrigerant into a gas.

Flue: Exhaust pathway for combustion gases.
Freon: Trademarked name for refrigerants.
Furnace: Device that produces heat for a building.

Heat Exchanger: Transfers heat between two fluids.
Heat Pump: HVAC system that can both heat and cool a space.
HSPF: Heating Seasonal Performance Factor
Humidistat: Measures and controls humidity levels.
HVAC: Heating, Ventilation, and Air Conditioning.

IAQ: Indoor Air Quality
Infiltration: Uncontrolled outdoor air leaking into a building.
Inverter: Device that controls the speed of a compressor motor.

Manual J: Method for calculating heating and cooling loads.
MERV: Minimum Efficiency Reporting Value
MERV Rating: Indicates the effectiveness of an air filter.

NATE: North American Technician Excellence
NEMA: National Electrical Manufacturers Association

Package System: Single HVAC unit with all components self-contained.
Package Unit: Single HVAC unit that houses all components.
Refrigerant: Substance used for heat transfer in cooling systems.
R-Value: Measures insulation’s resistance to heat flow.

SEER: Seasonal Energy Efficiency Ratio
SEER Rating: Measures AC and heat pump efficiency.

Thermal Expansion Valve (TXV): Regulates refrigerant flow in cooling systems.
Thermostat: Controls the temperature of an HVAC system.
Thermocouple: Safety device detecting pilot light presence in gas systems.

UV-C: Ultraviolet-C light for air disinfection.
UVGI: Ultraviolet Germicidal Irradiation
VRF: Variable Refrigerant Flow

Zoned Heating and Cooling: Ability to adjust temperatures in different areas independently.
Zone Control: Ability to control temperature in different areas independently.
Zoning System: Divides a building into different heating and cooling zones.

We hope this glossary enhances your understanding of HVAC terminology and aids you in making informed decisions about your HVAC systems.

Scroll to Top