Glossary

Pounds per square inch, absolute.

National Energy Council / National Electric Code.

The material in a filter that traps and holds the impurities. These HVAC filter media include fiberglass filter media, polyester filter media, dog hair filter media, blue/green filter media, charcoal filter media, and others.

A type of heat, which when added to or taken from a substance, does not change the temperature of the substance yet enables the heat energy to change its state.

National Electrical Manufacturing Association.

The lighting of a gaseous mixture to the temperature at which combustion takes place.

Heating, Ventilating and Air Conditioning.

A measure of the percent of moisture actually in the air compared with what would be in it if it were fully saturated at that temperature. When the air is fully saturated, its relative humidity is 100 percent.

1,000 watts. A common unit of electrical consumption measured by the total energy created by one kilowatt in one hour.

The measure of the moisture content of air. Air conditioners can remove moisture for added comfort.