The effect of cooling by the radiation of heat from a building to the night sky.

A wood or gas burning heating appliance that fits into the opening or protrudes on to the hearth of a conventional fireplace.

A device that removes contaminants, by mechanical filtration, from the fresh air stream before the air enters the living space. Filters can be installed as part of a heating/cooling system through which air flows for the purpose of removing particulates b ...

Features and vegetation on the outside of or surrounding a building for aesthetics and energy conservation.

The quantity of heat produced to change a unit weight of a liquid to vapor with no change in temperature.

A house built into the ground or slope of a hill, or which has most or all exterior surfaces covered with earth.

A unit of measurement for the ability of a material to retard the diffusion of water vapor at 73.4 F (23 C). A perm, short for permeance, is the number of grains of water vapor that pass through a square foot of material per hour at a differential vapor p ...

A device that converts heat or sunlight directly to electricity, invented by Standford Ovshinsky, that has a unique glass composition that changes from an electrically non-conducting state to a semiconducting state.

A curve that indicates the number of hours per year that specific wind speeds occur.

A device used to control temperatures; used to control the operation of heating and cooling devices by turning the device on or off when a specified temperature is reached.

A type of heating system where heat, resulting when electric current flows through an "element" or conductor, such as Nichrome, which has a high resistance, is radiated to a room.

A way of joining photovoltaic cells by connecting positive leads to negative leads; such a configuration increases the voltage.

The processes that a work input/output system undergoes and in which the initial and final states are identical.

A construction element used for ceiling support.

A turbine that is driven by high velocity jets of water or steam from a nozzle directed to vanes or buckets attached to a wheel. (A pelton wheel is an impulse hydroturbine).

The concept of capturing and converting the energy available in the motion of ocean waves to energy.

Energy supplied during periods of relatively high system demands as specified by the supplier.

The transfer of heat through matter or space by means of electromagnetic waves.

The period of low energy demand, as opposed to maximum, or peak, demand.

A system capable of rotating about one axis.