I “acquired” a new 15,000 BTU window a/c unit and wanted to use it in my garage, but did not want to modify my wall and outside stucco for the hole, nor to install a window as the bracing and building permit seemed too much of a headache and might take too long. I next considered cutting a square hole in my man-door, but decided not to once I came up with this idea:
This was some spare plywood I had laying around that is about 1/4”-1/2” too short length wise (i’ll have to put some foam or something along the top if it becomes a true concern). When not in use, I can easily remove the window a/c and store it somewhere, same with the board itself. I know I’ll have to put some asphalt shingles for the outside soon before it ruins the board, or weather seal it. Undecided. I was going to consider putting a platform for the window a/c to sit upon, but it fits evenly and snugly right into the hole.
Now, I have a/c (even if it’s just a window a/c) in my shop. We have had about 2-3weeks of 100 degree days here in Reno, NV (happens every year) which has barred me from getting in there even with R-19 insulation batts in the ceiling (it help alot, but still).
-- Yes, my profile picture is of a Carpenter Bee! The name is derived from the Ancient Greek "wood-cutter"