Tim,
Sadly, look at the degree day data with the dumb and smart thermostat. Yes, you paid 5% less with the smart one, but the heating load, as measured by degree days, was 11.5% lower in the interval when the smart one was in use.
I support programable thermostats for the right application, but I not sure this data proves your point.
Steve
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consulting on geothermal heating/cooling & rational energy use since 1990
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