We all have our definitions of comfortable as in winter months. With at best R9 in the walls, usually single pane windows, and the average "drafts" associated with our units ... mid to low 20's gets out of our comfort zone. Skirting and plastic wrap on the windows helps. I grew up in an old farm house in Missouri ... layering clothes, always wearing shoes or slippers, and accepting 65 degrees to be "comfortable" is not a way of life I wish to return to. The "artic package" is basically an extra 1/4" layer of astro foil in the basement.
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