These are all good things to know - it seems much easier to warm up a cool room/animal in a power outage than to cool off a hot one. And yeah, this is why I figured I'd ask, to see if it was even doable - if I can't keep them safely I'll just have to knock them off the list for now. When I saw their range was 65-75F it sounds easy because you think "oh that's just room temp, great!" But since they can't go far out of that at all, I'm starting to see why they're not very commonly kept.
As for the BPs, if the heat wave had gone on for more than 2 days I was going to switch off their heat, but luckily it ended, and we got decent temperature drops at night. I left them alone for a few days afterwards to get over it, no feeding or handling, and they seem ok now. But I was thinking to myself "if I'd gotten that gecko after all it'd be dead or in bad shape now" so I was curious if there was some tool or setup or something I didn't know about.