A term used to describe short and long-term affects on the Earth's climate as a result of human activities such as fossil fuel combustion and vegetation clearing and burning.

A type of furnace in which fuel is spread, automatically or mechanically, across the furnace grate.

A mixture of substances that has a melting point lower than that of any mixture of the same substances in other proportions.

A type of heating appliance that performs more than one function, for example space and water heating.

Technologies that pertain to the generation of electricity.

A type of anaerobic digester that has a mechanical mixing system and where temperature and volume are controlled to maximize the anaerobic digestion process for biological waste treatment, methane production, and odor control.

The value or purchasing power of a dollar that has not been reduced to a common basis of constant purchasing power, but instead reflects anticipated future inflation; when used in computations the assumed inflation rate must be stated.

The amount of energy absorbed (or converted) by a solar collector (or photovoltaic cell or module) over a 15 minute period.

An electrically charged atom or group of atoms that has lost or gained electrons; a loss makes the resulting particle positively charged; a gain makes the particle negatively charged.

An open-loop solar heating system in which the heat transfer fluid from the collector loop and the piping drain into a drain whenever freezing conditions occur.

A thermostat that can be set to automatically lower temperatures in an unoccupied house and raise them again before the occupant returns.

A complete PV power system composed of the module (or arrary), and balance-of-system (BOS) components including the array supports, electrical conductors/wiring, fuses, safety disconnects, and grounds, charge controllers, inverters, battery storage, etc.

All the natural and living things around us. The earth, air, weather, plants, and animals all make up our environment.

Materials that prevent or slow down the movement of heat.

The demand on an energy producing system; the energy consumption or requirement of a piece or group of equipment.

An electric generator consists of an armature and a field structure. The armature carries the wire loop, coil, or other windings in which the voltage is induced, whereas the field structure produces the magnetic field. In small generators, the armature is ...

A plastic foam insulation product, pressed or extruded into board-like forms, used as sheathing and insulation for interior basement or crawl space walls or beneath a basement slab; can also be used for exterior applications inside or outside foundations, ...

A complete lighting unit consisting of a lamp(s), housing, and connection to the power circuit.

The sum of sensible heat and latent heat in a substance above a base temperature, typically 32 degrees Fahrenheit.

A thermodynamic property of a substance, defined as the sum of its internal energy plus the pressure of the substance times its volume, divided by the mechanical equivalent of heat. The total heat content of air; the sum of the enthalpies of dry air and w ...