Glossary of Applied Air HVAC Terminology

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
Latent Cooling Load
The net amount of moisture added to the inside air by plants, people, cooking, infiltration, and any other moisture source. The amount of moisture in the air can be calculated from a combination of dry-bulb and wet-bulb temperature measurements.
Latent Heat
Heat, that when added or removed, causes a change in state - but no change in temperature.

LEED
The Leadership in Energy and Environmental Design green building rating system is a nationally recognized benchmark for the design, construction, and operation of high performance buildings.
Linear Feet per Minute (LFM)
A unit of measurement. The velocity of the air.
LonTalk

LonTalk is a communication protocol developed by Echelon Corporation that allows various pieces of HVAC equipment in a building to share information and control signals.  LonTalk is open to manufacturers who choose to pay Echelon Corporation a royalty for the use of the protocol.