Speaking of unheated garages, mine is attached but on the north side. It sucks because I would store liquids and they would freeze thus make them unuseable. I would have to move them inside over the winter.
We got a new garage door due to hail and got an insulated one. That made a big difference. I don't know if you could do a DYI slapping up foam boards (glue) in the door panels??
This last fall, I added more insulation in the crawl space above the garage (r13) to overlay the existing insulation.
It just got below freezing this last weekend. I am in NE KS.
Thinking these might be a simple band aide.
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