I'm wondering what's the best approach on installing a small .75hp window type aircon. I have attached a photo on where I think the aircon should be placed. The Red box(location B) is ideal I think but my problem is the wall is old concrete so it maybe hard for me to break the concrete. The green box(location A) would be easier but would look uglier? And I would have to cut through the metal framing for the aircon's body to go through. Can you guys give me a bit of advice on how to go through this?

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