Shit insulation is actually more of a pro argument for AC. I mean, the houses in the USA are made out of cardboard and gipsum. They dont insulate a thing. My house has great insulation. In summer I just keep the windows closed and roll down the shutters during daytime and it's freezing cold inside. At night we get cool wind from either the North or Baltic sea, we then open up the windows to freshen the air up a bit.