I'd want heating and cooling costs split. I'm a lot more willing to put up with some hot days. Also helps account for one system being inefficient (in a house w

I'd want heating and cooling costs split. I'm a lot more willing to put up with some hot days. Also helps account for one system being inefficient (in a house with separate heating and cooling). At some level it would make sense for municipalities to actively identify inefficient buildings and offer the owners incentives to improve them. Fraught, but likely to improve things faster than waiting decades for stock to cycle.