A construction element used to cover the exterior of wall framing and roof trusses.

A deposition process whereby heat is used to break molecules into elemental sources that are then spray deposited on a substrate.

A unit of illuminance; equal to one lumen per square foot.

A solar energy system designed to provide heat to individual rooms in a building.

A device that converts high-pressure steam, produced in a boiler, into mechanical energy that can then be used to produce electricity by forcing blades in a cylinder to rotate and turn a generator shaft.

A measure of the ability of a light source to show colors, based on a color rendering index.

A plot of a wind energy conversion device's power output versus wind speed.

A unit for the quantity of electricity transported in 1 second by a current of 1 ampere.

The air that is supplied to the combustion chamber of a furnace.

A type of automatic thermostat (used on solar heating systems) that responds to temperature differences (between collectors and the storage components) so as to regulate the functioning of appliances (to switch transfer fluid pumps on and off).

A heating system in which steam or hot water for space heating or hot water is piped from a central boiler plant or electric power/heating plant to a cluster of buildings.

A glazed structure, such as greenhouse or "sunspace."

The practice of installing blow-in, loose-fill insulation at a lower density than is recommended to meet a specified R-Value.

Energy that is capable or available for doing work; the time rate at which work is performed, measured in horsepower, Watts, or Btu per hour. Electric power is the product of electric current and electromotive force.

A type of window glazing films used to block the infrared (heat) portion of the solar spectrum but admit a higher portion of visible light.

Strips of material used to separate multiple panes of glass within the windows.

A type of water heater in which heated water is stored within the tank. Hot water is released from the top of the tank when a hot water faucet is turned. This water is replaced with cold water that flows into the tank and down to just above the bottom pla ...

In reference to solar photovoltaic devices, a material that is composed of a single crystal or a few large crystals.

The monochromatic irradiance of a surface per unit bandwidth at a particular wavelength, usually expressed in Watts per square meter-nanometer bandwidth.

Energy loads that can be shut off or disconnected at the supplier's discretion or as determined by a contractual agreement between the supplier and the customer.