I hate to hear of folks being cold in the winter.However if your interested in a Hearthstone one which will give you the most heat I can think of call this gentleman.His name is Randy.He rebuilds them and is in Vermont.He built mine for $1200.00 and brought it to me for $200.00 and put it in my basement.Can't beat the price and the stove is beautiful and heats like nothing I've ever experienced and I've experienced many stoves.His number is 802-279-7298.Even if you decide against going with the stove tell him about you situation and see what he says.Good Luck.I cannot tell what r value is behind the Sheetrock but it is there, I would assume r13/15 behind the walls but can’t say for sure. The roof is another story... there is absolutely zero access to see the roof insulation, no attic. Framing also looks to be double roofed as I have a skylight that is flush with the outside roof like but looks sunken 3 ft when looking up from my bedroom. Previous homeowner said “very well insulated roof, no idea what that means.
IMO the insulation of this house would get a grade or C, after I sealed a ton of draft points maybe a B-. I’ve noticed in the short work I’ve done that th house is already 3 degrees warmer running the wood stove and not changing any other variables
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