Forum Discussion
coolbreeze01
Feb 11, 2014Explorer
R-Values are advertised by brands that claim to be 4-season. The basic problem is thin walls.
At least 4" walls and dual-pane windows would be a start. Good luck, and I hope you find a warm unit :C
At least 4" walls and dual-pane windows would be a start. Good luck, and I hope you find a warm unit :C
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