At 28 F my furnace would only run about half the time. Remember the fan keeps running for a few minutes after the heat cuts off but it does sound like yours is running a little more than it should. I have dual pane windows but the difference should not be that great.
In a CG, I prefer the quiet of an electric heater but to keep the plumbing from freezing we have to use our furnaces if it is real cold. Outside temps above freezing, I will use my Fireplace only.
Don & Donna
Vancouver Island
2005 Ford F350 V10 Lariat CC 4x4 LB SRW 11200 GVWR
2006 Montana 2955RL
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