I think I misread your question so I over shot the moon…lol.
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If you’ve ever stayed at a hotel, you have probably seen a package unit. It just looks a little different than the OP’s unit. I have seen these used in a residential application, such as for a four season room.
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Just to expand on @rbleich
His photo represents a ptac unit which has louvered thru-wall access to the exterior.
“packaged terminal air conditioner”
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