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hr-ft2 F Btu

The U-factor is the reciprocal of the total resistance

1 1 Btu

The heat loss is calculated by multiplying the U-factor by the area and the indoor-outdoor temperature difference.

The accuracy of the previous calculation is dependent on at least two important assumptions. The calculation assumes:

1. The insulation is not compressed; and

2. The layer(s) of insulation has not been compromised by penetrations of more highly conductive building materials.

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