Cats rev high and love warmth. Of course there's such a thing as "too hot" for them just like there is for us, so TYSM for ordering a fan and running in AC for those times when it's needed! As long as Oscar has cool water (you can put ice cubes in his water bowl) he should be okay. He'll come down from the heights if it gets too hot. If he has a concrete or other smooth floor, he'll take advantage of that if he feels too hot.My biggest fear is that he’s gotten heat stroke up in the top! I hope he’s drinking at least. I ordered a fan and am also bringing up an air conditioner on Tuesday to run an extension cord from the house and put in the window since he doesn’t yet have catio access. It’s not going to be as hot luckily but that first two days tues wed in there is was very warm. Ugh. Worrying about this long-haired boy is going to do me in!!