I lifted the rug on the living room slide and found light from outside. So I put some insulation in there to help eliminate that draft. It was on both corners. The walls have only a R7 insulation factor. I went through 30 lbs of propane every three days when it got cold. It got down to 17 and the water lines did not freeze so I got what I paid for, a unit that would handle the colder weather. I just heated the outside a lot. When above freezing I used the fireplace and a ceramic heater. I did have to plug the ceramic heater into the circuit for the washer/dryer to keep from blowing a circuit breaker.
Good luck and stay warm.
Cheers,
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