Daox,
You are right about the therm reduction (60.8 to 51.0 =-16.12). However the reduction of degree days is 1029 to 911 = -11.47.
So , despite a decrease in the heating load of ~ 11.5%, there was a reduction in gas usage of 16%.
Maybe that difference was where the 5% reduction came from . . . .
Steve
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consulting on geothermal heating/cooling & rational energy use since 1990
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