I had my exterior walls pumped full of insulation,2x4 walls = r13 I think it made a big diff. in the heating of my home, NOTE that put some 500 2-3 in holes on the inside ! I had a drywall man fill them and texture the walls for 500 bucks ,not too bad on cost. I also went with r38 ceiling insulation ca. required when you do a remodel. I have a raised foundation and will do the floor this winter cooler working conditions.
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