Well I live in coastal Georgia and a few weeks ago my AC went out. It was in the 90s outside so it quickly started to heat up in my house. I brought a large fan into the herp room and made a make shift swamp cooler, sprayed down all of my cages super well and made an emergency run to Lowe's for a portable AC unit. Of course when I got the thing home the part that goes into the window for ventillation did not fit in my windows--too wide! So I pulled out the window AC unit that I have in the garage where my rat breeding colony is set up and put it in the herp room window. Several hours later it stormed and our power went out, but luckily the sun had gone down so it was cool enough that with extra misting the temps were okay.
If it really came down to it though, and I had no AC and no power, I would pack up all of my rhacs into deli cups and portable containers and go to a hotel. Hopefully I would be able to get everyone packed up quickly enough, but there is no way they could stay in an un-air conditioned location in hot weather. If you only have a few animals you could very quickly and easily do this as long as you keep some emergency, portable containers on hand.