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Obviously this is a spring project, but trying to get atypically organized ahead of time.

We’re looking to get a new air conditioner and put it through the back wall of our building below a window, in a new sleeve.

Building is landmarked, but this is in the back, not visible from the street.

Would very much appreciate recommendations for folks who have done this job, as well as typical costs, pointers for what to do/what not to do, etc. Many thanks!