keeping temperate reptiles cool in heat wave?

[Homebody]

I've been eyeing a Chinese cave gecko (Goniurosaurus hainanensis) for awhile, but there's one thing they need that I am not sure how to provide - from what I've read they're a cold-climate species and being exposed to temps over 80F can be life-threatening for them. We recently had a weird heat wave here and my apartment doesn't have AC, so it was around 83-85F indoors for a few days. Even the snakes didn't seem to like it, they both went to their cool sides and acted cranky. For reptiles that need cool temps, how do you manage this? Place the enclosure on the floor and point a fan at it? Do you offer something like a granite tile they can lay on to cool off? I'd rather be prepared for this type of thing before getting a gecko so that I know I can manage them if it happens again.

During a recent heat wave, I started putting half gallon ice blocks in the enclosure. It worked great, but I keep a Children's python and they tolerate a wide range of temperatures.