I looked into split system A/C when I moved to NYC. The gist is that attaching anything to outside of a "historical" building requires planning approval, comple

I looked into split system A/C when I moved to NYC. The gist is that attaching anything to outside of a "historical" building requires planning approval, complete with engineering drawings and a public hearing. But hanging a window A/C out into the street? Somehow this does not affect historicity and so no approval is required. I'm vague on whether the rules apply to non-street facing installations (I live at the back of my building), but I don't know if I can be bothered to spend the money to find out. So window A/C it is.