British thermal unit

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British Thermal Unit

The energy needed to raise the temperature of one pound of water one degree Fahrenheit. It is used in the United Kingdom, the United States, and a few other countries to measure the energy used by appliances like heaters and air conditioners. In the metric system, the equivalent of the British thermal unit is the joule. It is abbreviated BTU.
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British thermal unit (BTU)

A unit of measure of heat,used in rating the capacity of air conditioning and heating equipment.One BTU is the amount of energy necessary to raise the temperature of 1 pound of water by 1 degree Fahrenheit.
The Complete Real Estate Encyclopedia by Denise L. Evans, JD & O. William Evans, JD. Copyright © 2007 by The McGraw-Hill Companies, Inc.