A measure of the moisture content of air; may be expressed as absolute, mixing ratio, saturation deficit, relative, or specific.

A cooling device that uses mechanical energy to produce chilled water.

A building heating, ventilation, and/or air conditioning system that distributes conditioned air to individual zones or rooms.

A system of astronomical time in which the sun crosses the true north-south meridian at 12 noon, and which differs from local time according to longitude, time zone, and equation of time.

The highest possible pressure in a fuel-air mixture before spontaneous ignition occurs.

A colorless, odorless, tasteless gas composed of one molecule of Carbon and four of hydrogen, which is highly flammable. It is the main constituent of "natural gas" that is formed naturally by methanogenic, anaerobic bacteria or can be manufactured, and w ...

A group of solar photovoltaic modules connected together.

Air that provides the necessary oxygen for complete, clean combustion and maximum heating value.

This type of heat pump is known as an air-to air system.

The temperature of the air as measured by a standard thermometer.

A utility owned by stockholders or other investors; sometimes referred to as a private utility, in contrast to a public utility that is owned by a government agency or cooperative.

A load management objective that moves loads from on-peak periods to off-peak periods.

The demand of a consumer of electricity at the time of a power supplier's peak system demand.

Any liquid petroleum product burned for the generation of heat in a furnace or firebox, or for the generation of power in an engine. Domestic (residential) heating fuels are classed as Nos. 1, 2, 3; Industrial fuels as Nos. 4, 5, and 6.

A device or material with a high resistance to electricity flow.

Infrared or radiant heat.

An unregulated subsidiary of an electric utility that is allowed to generate and sell wholesale power as an independent energy producer, and is exempt from the Public Utility Holding Company Act of 1935.

In reference to solar thermal collectors, the condition where the heat transfer fluid is flowing through the collector loop under normal operating conditions.

The vacancy where an electron would normally exist in a solid; behaves like a positively charged particle.

Turning off or disconnecting loads to limit peak demand.