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If 6-in fiberglass costs $0.40 per square foot, what will be the payback time (as a result of energy savings) on this installation?

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The following problem can illustrate the economics of insulating the floor above a vented crawl space.
a. If the composite structure of the floor is made up of carpet (with an R-value of 0.5 ft2-°F-h/Btu), subfloor (R = 1.0), and air space between the joists (R = 0.8), then find the total R-value.
b. If 6” of fiberglass (R = 19) is added between the joists, then find the percentage reduction in the heat loss.
c. If there are 6500 degree-days in this area, and the price of fuel is $10 per million Btu, then find the heating cost per square foot per heating season for the un-insulated floor.
d. If 6-in fiberglass costs $0.40 per square foot, what will be the payback time (as a result of energy savings) on this installation?

 
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