Removing AC Wall units - how should I fill the hole?

Hi all,
I'm trudging through the woes of my first rental property. The previous owner had recently installed central air but left 2 old and dusty AC units in the wall. What is the best way to go about patching the holes when I remove the units? I need a three or four year fix. I was thinking about installing two thick pieces of plywood on either side and them securing them with 4 toggle bolts and then sealing with silicon and then painting. My other option is to call a professional, which would make more sense. What type of solutions should I look for. Drywall on the interior would be nice and smooth, but how would all of this take place?
Thanks!
Steve
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Your first concern is excluding water and air. You don't mention the exterior siding... Add 2x4 nailers within opening to position sheathing patch. Patch in a piece of sheathing with outer face matching plane of existing sheathing. sealant at edges would help. Patch in a piece of building paper lapped to shed water to complete that system. Add insulation in cavity. Patch in interior finish. TB
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Tom Baker wrote in message

I think the first concern should be to make sure the holes in the wall where done properly in the first place using a header otherwise removing the units and not filling the gap adequately may lead to more serious damage.
JMO
Dan O.
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That would look ugly. You should fix it so that it is undetectable that the wall A/C unit was never there. On the interior this might include doing some drywall and painting an entire wall (still no big deal IMO). On the outside I can't say what that would entail because you have provided no details.
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Thanks for the input. The wall is concrete block.
On 20 Jul 2004 05:31:03 -0700, scott snipped-for-privacy@my-deja.com (Childfree Scott) wrote:

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<< Thanks for the input. The wall is concrete block. >>
You should have mentioned this in your original post. In any event. a bag of Sakrete mason mix and some concrete blocks spliced into the hole will work just fine. Rent a diamond blade saw to size the blocks the way you want them. Get a book on masonry projects to learn some elementary techniques. Some plaster mix on the interior will finish the job. A pro bricklayer and a helper can do the pair in day if you find it too frightening. HTH
Joe
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