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

A type of motor that has a rotor with electrical windings connected through slip rings to the external power circuit. An external resistance controller in the rotor circuit allows the performance of the motor to be tailored to the needs of the system and ...

A room heat delivery (or exchanger) component of a hydronic (hot water or steam) heating system; hot water or steam is delivered to it by natural convection or by a pump from a boiler.

The energy developed through the use of heat energy.

Standardized weights or volumes for heating fuels.

The total diffuse and direct insolation on a horizontal surface, averaged over a specified period of time.

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

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

A heat exchanger for recovering heat from flue gases for heating water or air.

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

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

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

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.

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

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

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