I was “given” a new 12,000 BTU window a/c unit (free!). It’s time to put this puppy to work in my 22’x22’ garage. However, I have no windows. This unit is 19” wide and will fit between my 24” OC studs so no king stud framing or headers required. I have to decide to cut an opening in the OSB/stucco or cut hole in the man-door. Decisions decisions. I have to consider sealing and weather proofing any opening, and also in case I ever move, how to plug hole back up.
For permanent wall mount thru OSB/stucco… flashing will be required (never done this before) and other sealing aspects that I’ve never done, so kinda spooky as I do not want to damage or rot garage wall structure. For man door, it’s not a big issue because can just replace door and less building code to worry about. I am really leaning towards the man door because I never use it. If I did open it with the window a/c mounted there, I could use a brace on the floor while it was open.
I even considered having a/c sit inside, hanging close to my reznor natural gas heater and just vent the rear hot air out the same outside vent after decoupling the reznor and coupling a/c. Which would be the easiest and cheapest solution. similar to this youtube video of sealing rear of unit to exhaust out.