Assume an 80 percent-efficient furnace and the cost of natural gas at 86 cents per therm.
Therms needed to heat your house at 72 degrees for a month
334
Cost of 334 therms
$287.24
Therms needed to heat your house at 68 degrees for a month
286
Cost of 286 therms
$245.96
Monthly savings
$41.28
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