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The refrigeration system in the central plant of a central system is usually in the form of a heater package with an outdoor condensing unit.

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For energy transport, the heat capacity of air is about 3 400 times greater than that of water.

An individual air-conditioning system normally employs either a single, self-contained, packaged room air conditioner (installed in a window or through a wall) or separate indoor and outdoor units to serve an individual room.

If the ultimate chemical analysis is known, approximate heat values can be determined for all of the coals.

For the low or net heat of combustion, it is assumed that all products of combustion remain in the gaseous state.

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