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I’m curious what Stephen is specifically referring to as the DOB limit because we’re happy to push them on that. (I’ll dm you Stephen to get lunch or coffee or something to talk if ur interested)

It’s not the state law that stops it - there’s plenty of building not covered by windows you can mount and drill the 3” or smaller hole to put a heat pump’s mechanicals through. You can see retrofits up here in Rochester and Buffalo. Not NYC density (obviously) but still urban density.

The state goverment is involved in local lawmaking to an unusual degree in NYC, isn't it?

The issue preventing window units is largely a kind of vague mechanical code item requiring a level working space in front of equipment. The city could change it itself, either in the text by DOB proposing a change and City Council ratifying it.