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B

Balance Point

An outdoor temperature, usually between 30° and 45° Fahrenheit, at which a heat pump’s output equals the exact heating needs of the home or business. Below the balance point, supplementary electric resistance heat must maintain indoor comfort.

Blower

An air-handling device for moving air in a distribution system.

BTU (British Thermal Unit)

The standard of measurement used for the amount of heat required to raise the temperature of one pound of water by one degree (Fahrenheit). BTUH = the number of BTUs per hour.