The use of direct, diffuse, or reflected sunlight to provide supplemental lighting for building interiors.

The control of the quality, quantity, and temperature-humidity of the air in an interior space.

A movable plate used to control air flow; in a wood stove or fireplace, used to control the amount and direction of air going to the fire.

That fraction of annual energy demand supplied by a solar system.

The process of determining energy consumption, by various techniques, of a building or facility.

An ideal substance that absorbs all radiation falling on it, and reflecting nothing.

A standard unit of electrical power equal to one thousand watts, or to the energy consumption at a rate of 1000 Joules per second.

A unit of electrical force equal to that amount of electromotive force that will cause a steady current of one ampere to flow through a resistance of one ohm.

A material or structural element that inhibits air flow into and out of a building's envelope or shell. This is a continuous sheet composed of polyethylene, polypropylene, or extruded polystyrene. The sheet is wrapped around the outside of a house during ...

Biomass converted directly to energy or converted to liquid or gaseous fuels such as ethanol, methanol, methane, and hydrogen.

An insulation product composed of loose fibers or fiber pellets that are blown into building cavities or attics using special pneumatic equipment.

see Air-Source Heat Pump.

Water saturated or strongly impregnated with salt.

A mechanical device used for air circulation and to provide cooling.

An opening; in solar collectors, the area through which solar radiation is admitted and directed to the absorber.

Referring to alterations in the environment due to the presence or activities of humans.

A measure of seasonal or annual efficiency of a central air conditioner or air conditioning heat pump. It takes into account the variations in temperature that can occur within a season and is the average number of Btu of cooling delivered for every watt- ...

The total cost of production divided by the total quantity produced.

In reference to solid biomass fuels, such as wood, having zero moisture content.

A structural, load-carrying building member with an open web system that supports floors and roofs utilizing wood or specific steels and is designed as a simple span member.