Secure the side panels with screws.
How to put a window ac in a wall.
Extend the accordion panels from both sides of the air conditioner to the window sash track.
Before installing a window ac open the window as far as it goes remove the screen and clean the windowsill glass and window frame.
Do prepare the window and install brackets if necessary.
Use the level to ensure it is level and hammer it into place with nails into the opposing studs.
Measure the height of the wall opening and subtract the combined thickness of the 2 x 4 s you just cut.
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.
Remove the drywall to reveal insulation and the edge of a stud.
Then cut those down to the matching lengths.
Measure the width of the wall opening and transfer that measurement to 2 2 x 4 s and cut them down to the matching length.
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.
In the 3 8 c channel insert nut rod coupling on the end.
Measure a 2 by 4 and saw it to fit on top of the cut vertical wall studs at the bottom of the hole.
Cut the strip of foam to the correct length and insert it between the upper window sash and the lower window sash.
Drill hole on the side through channel and coupling than insert a screw.
With the insulation removed mark the opening corners by drilling through the exterior sheeting with a long drill bit.