BTU
BTU stands for British Thermal Unit, which is a standard unit of measurement used to quantify heat energy. Specifically, one BTU represents the amount of heat needed to increase (or decrease) the temperature of one pound of water by one degree Fahrenheit at standard pressure. The term is widely used in HVAC to measure the heating or cooling capacity of equipment. For instance, air conditioners, furnaces, and heat pumps are often rated by the number of BTUs they can transfer per hour.
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