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I am about to buy a through the wall A/C unit for a small building, which the builder will frame out for the A/C. Is the framing enough, or do I need to buy a sleeve for A/C?

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Ultimately, you'll want to consult the manufacturers installation instructions. You may find that some units don't have a case, and rely on the sleeve to protect/cover their internal bits and bobs.

Whether or not the unit has a case, installing a sleeve is usually a good idea. The sleeve allows you to insure the opening is sealed properly, before installing the unit. It also allows you to remove old units and install new units, without worrying about sealing the opening.

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  • I did install the sleeve, and I'm glad I did. The builder told me I didn't need one, but I took your advice instead and it worked out great.
    – John
    Feb 19, 2014 at 20:32

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