Materials with various qualities that are applied to glass windows before installation. These coatings reduce radiant heat transfer through the window and also reflects outside heat and a portion of the incoming solar energy, thus reducing heat gain. The ...

Energy output from a system that equals energy input.

These lights use an electrically heated filament to produce light in a vacuum or inert gas-filled bulb.

One thousand kilowatt-hours or 1 million watt-hours.

The transmission of electricity through power lines.

A measure of the amount of energy lost during the generation, transmission, and distribution of electricity.

A gas or liquid used to move heat energy from one place to another; a refrigerant.

A heating system that uses only outside air for combustion and vents combustion gases directly to the outdoors. These systems are less likely to backdraft and to negatively affect indoor air quality.

A device used to measure total incident solar radiation (direct beam, diffuse, and reflected radiation) per unit time per unit area.

A wood-burning appliance for space and/or water heating and/or cooking.

The change in direction of a ray of light when it passes through one media to another with differing optical densities.

This designates the resistance of a material to heat conduction. The greater the R-value the larger the number.

An electricity powered device that extracts available heat from one area (the heat source) and transfers it to another (the heat sink) to either heat or cool an interior space or to extract heat energy from a fluid.

The ratio of fuel energy input as heat per unit of net work output; a measure of a power plant thermal efficiency, generally expressed as Btu per net kilowatt-hour.

The ability to send or wheel electric power to a customer over a transmission and distribution system that is not owned by the generator (seller) of the power.

The unit price of a good or service estimated from some base year in order to provide a consistent means of comparison.

An aluminum foil fabricated insulator with backings applied to provide a series of closed air spaces with highly reflective surfaces.

The maximum instantaneous wind speed (or velocity) that occurs within a specific period of time or interval.

This is a national organization dedicated to representing the interests of cooperative electric utilities and the consumers they serve. Members come from the 46 states that have an electric distribution cooperative.

A device that produces mechanical energy directly from two heat reservoirs of different temperatures. A machine that converts thermal energy to mechanical energy, such as a steam engine or turbine.