I have foam insulation on the back of my garage door, which I’m sure helps, but sadly realized during the install of the portable AC that there was no insulation in the walls. It was already a finished garage, so no chance I was going to install it. I’m sure would be 1000% tighter with insulation in the walls, but still doable without. Particularly if you have the AC close to you and perhaps blowing on you.
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