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In terms of space heating, the big unknown is furnace efficiency. We know electricity is 100% efficient at producing heat, but that gas furnace, who knows? My guess is that it is no more than 50-60% efficient. If that is anywhere near right, you would have to burn nearly double the amount of propane BTU's to get the equivalent heating effect of BTU's provided from an electric heater.
May Ozz has a better handle on furnace efficiency.
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