This is a very interesting thread for me. My spouse is from Germany, and it was nice to hear that the tussles we have with opening windows in the middle of a New England winter are part of a much broader "war" ;-)

Also, in New England very few homes have central air - new construction and renovations do have central, but it seems a waste, given you only really need it in July and then usually the nights (when we are in the house) are cool.

But yes, this month and a few days in June I think, every day, so, how much would it cost to put in a ductless in the bedrooms? The living room has a GIANT ancient wall mounted air-conditioner from the days of the cold war and moon landings which sounds like a rocket and seems to flood the first floor with cold air the moment you switch it on. I have not seen the electric bill yet.