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Estimate the percentage savings in the fuel bill if the thermostat is set back from 68...

Estimate the percentage savings in the fuel bill if the thermostat is set back from 68 degrees F to 50 degrees F for 12 hours of the day, and left at 68 degrees F for the other 12 hours, assuming an outside temperature of 15 degrees F all day. (If your answer is 45 percent, enter .45)

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