Heat Loss Calculator BTU Calculator. The total heat loss is a sum of losses through walls, floor, and ceiling. We compute the loss through a single surface from the equation: Heat_loss = Area * U-value, where. Area is the area of the surface, U-value is the U-value of the material. The heat loss through walls can be estimated in the following way.
Web This is to be used as an estimation. A detailed heat loss should.
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