Well, not for now but... But just for a single building how much "supporting infra" you have, meaning raw materials, and how limited heat-pumps heating you can

Well, not for now but... But just for a single building how much "supporting infra" you have, meaning raw materials, and how limited heat-pumps heating you can made there. If you extend that for a whole city it's clear that current research just see one aspect, instead of a TCO. It's like "rails are the most efficient ground transport" and that's true, if we count just a single journey an an already made network. Things dramatically changes if we count how much we need to develop and keep up rails, stations, intermodal exchanges and how much we need to change them. It's hard to compute of course, but it's easy to size a bit.