Leslie, did you check the responses to your post on 1/27?
We would need a lot more info to tell you how to close up the hole for the AC. The inside should be easy but the outside depends on your siding. Don't forget the insulation.
As far as cost, the biggest expense will be for the new HDTV to put in front of the cover-up of the hole.......kidding. Seriously, we need a lot more info to even guess at a cost.
Henry in MI
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