There are people who speak out against air conditioning, and they should be dropped, en masse, into a Bessemer converter.
Meanwhile, there are normal people:
I am relying on my window-unit air conditioner in my bedroom to keep it cooler at night. I feel slightly guilty about all the power I am using but I sleep SO MUCH BETTER in a cooler room. When it’s really hot and I have no relief, I wake up feeling like I didn’t sleep, and I have bad dreams when I do. (I wonder how people managed before air conditioning, especially in the South. Did stuff just shut down in the summer and the expectation was you got little useful work out of people?)
Southern houses, at least up until World War II or thereabouts, were generally constructed for maximum potential cool: cross-ventilation was a must, and windows were big and easily opened. Ceiling fans were ubiquitous: a big room might have two or even three. We didn’t have A/C during our eight years in South Carolina, and we weren’t the only ones either. And in Charleston in particular, there’s a lot of rain in the summer: six inches in a month is routine, and I’ve seen over 20.
Oh, and I have no guilt at all about running the A/C; I pay for these stinking kilowatt-hours, and I figure I can do as I please with them. In the summer, my bedroom is the warmest room in the house, so it gets a box fan. Besides, cooler rooms are healthier, period.