I have an air conditioner installed through the wall in my house. I plan to
remove it and need to close the hole. I'd like to do it myself rather than
pay someone but have no idea how to go about it. The house has aluminum
siding outside, and I have some spare pieces. The inside will eventually be
finished with drywall. The sides of the opening are framed. Do I need to add
a vertical piece of 2X4 at the center of the hole to support the drywall? Do
I just cut a piece of plywood and nail it on the outside? If so do I put
anything over the plywood or just put the siding on top of it? In other
words, I don't have a clue and could use some expert advice. Thanks.
Short answer is pay someone to do it unless your time is worth less than
$20/hr, especially since your learning curve is going to be high. I don't say
that to be disrespectful of either your skills or your intelligence, I say that
as a full-time employed father of a five year old. Jobs I used to do in my
copious spare time (which vanished with Jr's arrival) I now hire folks for.
The size of the hole, if it's typical of a thru-the-wall AC unit, doesn't
dictate a 2x4 cross-member. You can frame in (out?) the rough cavity on the
sides and top/bottom with 2x4 pieces to attach both the interior drywall and
the exterior wall.
What you use to close the opening on the exterior depends on what the rest of
the construction. Exterior grade plywood at the minimum or OSB, and if you can
overlap the seam with tyvek or other housewrap. The joint between the new
material and the rest of the exterior wall won't be airtight unless you use the
housewrap, not sure if that's anything you care about.
Before drywalling put in insulation appropriate to your climate. R-15/20.
Vapor barrier if you're not using housewrap, skip if you are.
Drywall and mud as necessary.
Dunno where you're located but I could probably pay someone around here
(Northern VA) are about $2-300 to have it done, which would be worth it to me.
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