(That's this summer.)
So far, it hasn't been too bad. We have a fan that we drag from room to room in our apartment throughout the day, and we stay pretty cool. It's nighttime that's bad; somehow all the heat from the day pools up in the bedroom and unleashes sweaty heatwaves all night, no matter how close the fan is or what setting it's on.
My solution, which has worked well enough, is to get everything ready for bed, take a cool shower, stand in front of the fan for a while until goosebumps appear, and then go to bed. My rationale for getting everything ready before taking a shower is that I don't want to exert much energy afterwards, lest I get hot and sweaty again.
The only problem with this situation is that I tend to wake up in the middle of the night, dying of heat, so I have to take another shower. But what isn't totally awesome about a shower at 2:30 a.m., right?
P.S. I saw Harry Potter and Voldemort and Malfoy hugged and I weirdly felt like my life was complete.