Calculating Heat Loss for a Door

It’s not easy to calculate the coefficient of heat transmission (U-value) for a door, because doors vary by size, thickness, and materials.

A fairly accurate rule-of-thumb method of calculating heat loss is to use the U-value for a comparable size single-pane glass window.

If you wish to compute the coefficient of heat transmission for a door, the necessary data can be found in ASHRAE publications. The same source can be used for calculating the coefficient of heat transmission of windows.

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