FYI my experience of these things is in an apartment building. Of course retrofitting old buildings is hard and landlords aren't incentivized to make changes wh

FYI my experience of these things is in an apartment building. Of course retrofitting old buildings is hard and landlords aren't incentivized to make changes which save energy (after all, the tenants are paying the bills), but new buildings can be built a lot smarter than what has been done previously. The whole building technology topic is very interesting, as even today in many parts of the developed world (southern US seems to be a big offender here) they still build residential buildings the same as they were done 70+ years ago.