Yes - We hit 20 below every winter and sometimes as low 35 below actual. The insulation in my barn keeps it incredibly warm for not having a heat source. The man cave in the barn does have an electric milk house heater to keep it at least 45-50 and then a wood stove when we want to warm it up but not much of that heat gets to the main part of the barn. I only have one window in the main barn. If I set a bottle of water on the window sill it would freeze, but I keep a bottle of water on a shelf in the interior of the barn and it never even gets any slush in it. Snow and ice usually melt off of my truck and my wife's car overnight.
6" of insulation in the walls and probably 14-15" over the ceiling makes all the difference in the world....cool in summer - warm in winter.
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