Remove the drywall to reveal insulation and the edge of a stud.
How to put a window ac in a wall.
Then cut those down to the matching lengths.
Cut two pieces of the c channel in both sizes1 2 and 3 8.
Measure a 2 by 4 and saw it to fit on top of the cut vertical wall studs at the bottom of the hole.
Put those four pieces of 2 x 4 lumber together to make a frame.
Use a utility knife to cut the roll insulation at the top and the bottom of the drywall opening.
Window air conditioners often come with a foam insulating strip.
Secure the side panels with screws.
Strictly speaking if you put a window unit in the wall it won t be vented correctly and it can overheat and die or have a shorter lifespan.
Drill hole on the side through channel and coupling than insert a screw.
In the 3 8 c channel insert nut rod coupling on the end.
With the insulation removed mark the opening corners by drilling through the exterior sheeting with a long drill bit.
Also putting a new window unit in the wall voids its warranty and it will be less efficient i e more costly because you ll have to fill more gaps between the smaller machine and the wall.
Measure your a c from left to right including your frame.
Before installing a window ac open the window as far as it goes remove the screen and clean the windowsill glass and window frame.
Extend the accordion panels from both sides of the air conditioner to the window sash track.
Measure the height of the wall opening and subtract the combined thickness of the 2 x 4 s you just cut.
Cut the strip of foam to the correct length and insert it between the upper window sash and the lower window sash.