A gas that does not react with other substances; e.g. argon or krypton; sealed between two sheets of glazing to decrease the U-value (increase the R-Value) of windows.

A type of heat pump that uses the ground, ground water, or ponds as a heat source and heat sink, rather than outside air. Ground or water temperatures are more constant and are warmer in winter and cooler in summer than air temperatures. Geothermal heat p ...

The distance between similar points on successive waves.

A registered trademark name for houses built with tires, aluminum cans, and earth.

The wheeling of electric power in amounts and at prices that generally have been negotiated in longterm contracts between the generator and a distributor or very large consumer of power.

A device that captures the heat from the exhaust air from a building and transfers it to the supply/fresh fresh air entering the building to preheat the air and increase overall heating efficiency.

The process of cooling by which a heat absorbing media absorbs heat from one source and radiates the heat away.

The amount of useful energy produced by a system less the amount of energy required to produce the fuel.

The standard method for calculating residential cooling loads developed by the Air-Conditioning and Refrigeration Institute (ARI) and the Air Conditioning Contractors of America (ACCA) based largely on the American Society of Heating, Refrigeration, and A ...

The coldest months of the year; months where average daily temperatures fall below 65 degrees Fahrenheit creating demand for indoor space heating.

A device that releases pressure within a radiator when the pressure inside exceeds the operating limits of the vent.

The structural elements (walls, roof, floor, foundation) of a building that encloses conditioned space; the building shell.

The amount of solar radiation striking a surface per unit of time and area.

A statement of the electric rate(s), terms, and conditions for electricity sale or supply.

The absolute centimeter-gram-second unit of force; that force that will impart to a free mass of one gram an acceleration of one centimeter per second per second.

Standardized weights or volumes for heating fuels.

Alternating current is carried by conductors and a ground to residential, commercial, or industrial consumers. The waveform of the phase power appears as a single continuous sine wave at the system frequency whose amplitude is the rated voltage of the pow ...

A description of how well people in a lighted space can see to do visual tasks and how visually comfortable they feel in that space.

The quantity of heat necessary to raise the temperature of a specific mass of a substance by one degree.

The amount of heat introduced to a space from all heat producing sources, such as building occupants, lights, appliances, and from the environment, mainly solar energy.