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Rick
Rick, General Contractor
Category: Home Improvement
Satisfied Customers: 21391
Experience:  Licensed construction supervisor with 35+ yrs. experience.
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I'd like to know what would be the best way to "seal" the

This answer was rated:

Hello,
I'd like to know what would be the best way to "seal" the hole in the wall around the AC unit. Is there any kind of product/material that I could buy and simply put it around the AC?
thanks!

Welcome to Just Answer, my name is ***** ***** I will do my best to help you with your issue. First I’ll need some more info so I have a more complete picture of you situation.

Can you explain a bit more about this issue? Do you have a through the wall AC unit that has a gap between the unit case and the opening in the wall? if so how big is the gap?

Customer: replied 10 months ago.

Hello Rick,

thanks for your answer.

Yes, it is a unit through the wall.

The hole is 27 x 17 inches and the AC unit is 24.2 x 14.5 inches. So yes, I'd like to fill/close/seal this 2.8 x 2.5 inches gap.

Ok, that's a really big gap to fill. There is no product made specifically to fill a gap that big so we'll have to improvise. I'd use rigid foam insulation here's an example from Lowes
http://www.lowes.com/pd/Kingspan-Insulation-R10-Unfaced-Polystyrene-Foam-Board-Insulation-Common-2-in-x-2-ft-x-8-ft-Actual-2-in-x-2-ft-x-8-ft/999972976

Cut pieces to fit tight into the openings. You can cut it with a knife but a saw is easier. You can paint it with exterior latex paint to protect if from UV sunlight on the outside and for a better color inside if you don't like the bluish green. Paint the outside before you install it if it's difficult to get to from outdoors.

Customer: replied 10 months ago.

Hello Ricky,

thank you so much for your answer. Although there's still one thing left... Is there anything I can do after filling the gap to give it a better finishing?

Thanks!

Inside you could cover it with 1/4 birch veneer plywood or something similar. Outside painting it is your best option. You could also paint the inside like I said before

Do you have any more questions?

Rick and other Home Improvement Specialists are ready to help you