Best Answer: BTU is an old fahioned term British Thermal Units and was used to calculate the amount of energy required to raise the temp of a room by a degree (using Therms as a unit here too), and is uses an energy calculation rather than a straight how much air does it push sort of calculation.est Answer: BTU is an old fahioned term British Thermal Units and was used to calculate the amount of energy required to raise the temp of a room by a degree (using Therms as a unit here too), and is uses an energy calculation rather than a straight how much air does it push sort of calculation.
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