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
Lithium Bromide Chiller
A lithium bromide chiller is an absorption cooling system that…
Lithium Iron Phosphate Battery
Lithium Iron Phosphate (LiFePO₄) batteries are rechargeable energy storage systems…
Load Calculation
A load calculation determines how much heating and cooling capacity…
Load Duration Curve
A load duration curve is a graphical representation that ranks…
Load Forecasting
Load forecasting estimates the amount of electrical power that will…
Load Shedding
Load Shedding is the controlled reduction or disconnection of electrical…
Load Shifting
Load shifting is the strategy of moving HVAC energy consumption…
Local Exhaust
Local exhaust systems capture air contaminants directly at their point…
Location Based Control
Location based control is an HVAC technology that adjusts heating…
Locked Rotor Amperage
The steady-state current drawn by a motor when its rotor…
Locked Rotor Amps
Locked Rotor Amps (LRA) is the maximum current a motor…
Lockout Relay
A lockout relay is a safety device used in HVAC…
LonWorks
A networking platform developed by Echelon Corporation using the LonTalk…
Loop Field Manifold
The header piping assembly that connects multiple individual geothermal loop…
Loop Temperature Range
The acceptable span of entering water temperatures within which a…
Loss Coefficient
A dimensionless number that quantifies the pressure drop across a…
Low Ambient Control
Low Ambient Control refers to a set of strategies and…
Low GWP Refrigerant
Low GWP refrigerants are cooling fluids with global warming potential…
Low Pressure Category
The Low Pressure Category includes HVAC systems and large appliances…
Low Pressure Switch
A Low Pressure Switch (LPS) is a safety device installed…
Low Refrigerant
Low refrigerant indicates the system contains less than the manufacturer-specified…
Low Temperature Cascade
The low temperature cascade stage is the coldest circuit in…
Low Velocity Duct
A low velocity duct is an HVAC ductwork system designed…
Low VOC Adhesive
Low VOC adhesive contains fewer than 100 grams per liter…
Low VOC Paint
Low VOC paint contains fewer than 50 grams per liter…
Low-Loss Header
A hydraulic separator that uses a large-diameter vessel to decouple…
Lower Room UVGI
Lower room UVGI refers to ultraviolet germicidal irradiation (UVGI) systems…
LWT (Leaving Water Temperature)
The temperature of the fluid exiting the heat pump heat…