Hmm, I've seen other online sources that said 88-92 was okay for ball pythons, but I certainly don't want to quibble over a couple degrees. Are there any signs to look for if he's getting any kind of nerve damage? I am definitely using a thermostat, but even with the pad regulated, I think the increasing temps lately comes from the increased ambient temperature as the weather warms up + the IR lamp (which, btw, never seemed to get the hot end surface up to any more than 85 in the winter months until I added the UTH). The surface temps had been slowly creeping up the last several days, so I was adjusting the pad down a degree or two at a time, but even with the thermostat set to 75 it was hovering in the low 90s, so I just turned it off, and now it's back down to around 90, give or take a degree.