Glossary of Heating, Ventilation and Air Conditioning Terms

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Balance Point

An outdoor temperature, usually between 30° F and 45° F, at which a heat pump's output exactly equals the heating needs of the home. Below the balance point, supplementary electric resistance heat is needed to maintain indoor comfort.


Brazing

A process that is used to bond similar or dissimilar materials by melting a filler metal or alloy placed between the components being joined. Brazes are filler metals or alloys that melt at temperatures above 450°C.


Breaker

A heat activated electrical device used to open an electrical circuit to protect it from excessive current flow.


BTU
A British Thermal Unit (BTU) is the unit of heat required to raise 1 pound of water by 1 degree Fahrenheit. Used for both heating and cooling, BTU is a measure of the heat given off when fuel is combusted. Or for cooling, it's a measure of heat extracted from your home. (One BTU is approximately equal to the heat given off by a wooden kitchen match.)
BTUH
British Thermal Units per Hour. A British Thermal Unit (BTU) is the unit of heat required to raise 1 pound of water by 1 degree Fahrenheit.
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