Glossary

A humidity sensing device designed to regulate humidity input by recting to changes in the moisture content of the air.

A machine that adds water vapor to the air to increase humidity.

Heating Seasonal Performance Factor. This rating is used in measuring the heating efficiency of a heat pump by taking in account the variations in temperature that can occur within a season and is the average number of BTU of heat dispatched for every watt-hour of electricity used by the heat pump over a heating season.

The ratio of the mass of water vapor to the volume occupied by a mixture of water vapor and dry air. It is measured in grams of water vapor per cubic meter of air.

Any coil that serves as a heat source.

The movement of heat energy from one area to another. The means for such movement are convection , conduction, and radiation. Heat will flow naturally from a warmer to a cooler space or material.

An automated compression cycle refrigeration system that can be switched to either heat or cool the controlled space.

The rate of heat transfer from a building interior to the outdoors.

A measure of the number of cycles or wavelengths of electrical energy per second; U.S. electricity supply has a standard frequency of 60 hertz.

The amount of heat introduced to a space from all heat producing sources by appliances, solar energy, occupant respiration and lighting.