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I have OSB on the inside of my 24' x 24' garage/workshop - 2x4 studs, kraft face insulation, 14" blown insulation in the attic - and installed a mini-split about 3 years ago and have had no problems. It keeps the shop cool in the summer and warm in the winter and has been surprisingly inexpensive to operate. The OSB makes it easy to hang things on the wall, although I still looks for studs if it's something heavy.

I guess that I should paint the walls one of these days to brighten things up......................


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