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The amount of moisture in the air. Air conditioners remove moisture for added comfort.


Regulates humidity input by reacting to moisture content changes in the air.


The process of adding moisture to the air within a space.


Heating, Ventilation and Air Conditioning.

Horizontal Furnace

A sideways furnace that draws in return air from one side and expels warm air from the other.

Heating Capacity

The rate at which a specific device can add substantial heat to a substance, expressed in BTUH (British Thermal Units per hour).

Heating Seasonal Performance Factor (HSPF)

The total heating output of a heat pump in BTUs during its normal usage period for heating, as divided by the total electrical energy input in watt-hours during the same period.

Heat Transfer

The movement of heat from one place to another, between two substances or within a substance.