A wall that carries ceiling rafters or roof trusses.

The cost of producing electricity up to the point of the powerplant busbar.

A fan mounted on an attic wall used to exhaust warm attic air to the outside.

A device that converts the mechanical energy of rotation into electricity based on electromagnetic induction. An electric voltage (electromotive force) is induced in a conducting loop (or coil) when there is a change in the number of magnetic field lines ...

The presence of contaminants in the air in concentrations that prevent the normal dispersive ability of the air, and that interfere with biological processes and human economics.

The ratio of light reflected by a surface to the light falling on it.

The process of decomposing biomass with anaerobic bacteria to produce biogas.

This is the voltage-ampere requirement of a device designed to convert electric energy to a non-electrical form.

A type of electric generator that produces alternating current that matches an existing power source.

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

The process of removing a power plant, apparatus, equipment, building, or facility from operation.

A material that retards the movement of water vapor through a building element (walls, ceilings) and prevents insulation and structural wood from becoming damp and metals from corroding. Often applied to insulation batts or separately in the form of treat ...

A category of electric power producer established under the Public Utility Regulatory Policy Act (PURPA) of 1978, that includes small-power producers (SPP) who use renewable sources of energy such as biomass, geothermal, hydroelectricity, solar (thermal a ...

The grilled opening into a room by which the amount of warm air from a furnace can be directed or controlled; may include a damper.

A building architectural element (vestibule) with two airtight doors that reduces the amount of air infiltration and exfiltration when the exterior most door is opened.

A unit for measuring the extent that the outdoor daily average temperature (the mean of the maximum and minimum daily dry-bulb temperatures) falls below (in the case of heating, see Heating Degree Day), or falls above (in the case of cooling, see Cooling ...

The positive pole or electrode of an electrolytic cell, vacuum tube, etc. (see also sacrificial anode).

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

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

The amount of heat energy needed to raise the temperature of a given mass of a substance by one degree Celsius. The heat required to raise the temperature of 1 kg of water by 1 degree Celsius is 4186 Joules.