The walls and ceiling of the home are in parallel so the overall U value is calculated by taking the inverse of the sum of the inverses of the ceiling and wall U values. The Total house U value is 0.02949 Btu/(hr*degF*ft^2).
The surface area of the home is about 2120 ft^2 so the overall thermal conductance (U*A) = 62.59 Btu/(hr*degF).
Sources: http://www.coloradoenergy.org/procorner/stuff/r-values.htm
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