Most through-the-wall units come with a metal sleeve. This is the skeleton of your project. Treat it with respect.
Trace the outline of the sleeve on your wall. Use a level! A crooked AC makes the room look drunk, and nobody wants that. Trust me, I’ve been there.
How to install a window air conditioning unit through a wall. - YouTube
Now, the part that makes you sweat: cutting the hole. Get a drywall saw (a sharp one, not the rusty one from grandpa’s shed). Cut along your traced lines. It’s loud, dusty, and you’ll find yourself talking to the wall. That’s normal.
Cutting Through the Outside Wall (The Scary Part)
Here’s the deal: you’re cutting through wood siding, brick, or stucco. Don’t panic. If you have brick, rent a hammer drill with a masonry bit. It’s like a jackhammer for your wall. Wear goggles. Safety first, fun second.
For wood siding, a reciprocating saw (Sawzall) is your best friend. Go slow. Cut the inside hole first, then punch through to the outside. You’ll see daylight. That’s a good sign. It means you didn’t cut into a neighbor’s apartment.
If you hit wiring or pipes, stop immediately. Call a professional. Do not become a cautionary tale on Reddit.
