What do you do to stay cool in the summer?

I try not to do a lot of strenuous work at home. I only have ONE room with AC, and the rest of my apartment gets HOT. I try to use fans to combat the worst of it, but have bad allergies, and the fans stir up dust.

I DON'T do laundry, because the laundry room downstairs gets really hot with all the dryers running.

I have to sleep in my underwear, and usually can't even stand to have a sheet on me.