An air conditioner consisting of one or more assemblies that move, clean, cool, and dehumidify air.

The measure of seasonal or annual efficiency of a heat pump operating in the heating mode. It takes into account the variations in temperature that can occur within a season and is the average number of Btu of heat delivered for every watt-hour of electri ...

The point or outdoor temperature where the heating capacity of a heat pump matches the heating requirements of a building.

The storage of heat energy during utility off-peak times at night, for use during the next day without incurring daytime peak electric rates.

The approximate energy producing capacity of a power plant, under specified conditions, usually during periods of highest load.

A material used to seal gaps around windows and exterior doors.

The cutting of a grid pattern of grooves in a semiconductor material, generally for the purpose of making interconnections.

The process of transmitting electricity over one or more separately owned electric transmission and distribution systems. (See Wholesale and Retail Wheeling.)

A device for converting mechanical energy to electrical energy.

A profile of how the wind speed changes with height above the surface of the ground or water.

A unit of rate of water evaporation equal to the evaporation per hour of 34.5 pounds of water at a temperature of 212 degrees Fahrenheit into steam at 212 degrees F.

The unit price and quantity to which it applies as specified in a rate schedule or contract.

A type of turbine in which combusted, pressurized gas is directed against a series of blades connected to a shaft, which forces the shaft to turn to produce mechanical energy.

A device mounted in the vent connector that closes the vent when the heating unit is not firing. This traps heat inside the heating system and house rather than letting it draft up and out the vent system.

Fuel gas with a heating value of between 200 and 300 Btu per cubic foot.

The visible portion of the electromagnetic spectrum with wavelengths from 0.4 to 0.76 microns

The physically connected generation, transmission, and distribution facilities and components operated as a unit.

The maximum load that a device is capable of carrying.

A heat storage system that uses a heat storage medium, and where the additional or removal of heat results in a change in temperature.

A group of wind turbines interconnected to a common utility system through a system of transformers, distribution lines, and (usually) one substation. Operation, control, and maintenance functions are often centralized through a network of computerized mo ...