The propane furnace is only 40-50% efficient and that is why there is so much heat coming out the exhaust. Don't try to recycle the exhaust. The CO will get you.
A tank a week is pretty reasonable for you situation.
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Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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