He has a UTH on a thermostat. I got a thermometer/hygrometer to put on the cool side. That's when things got crazy. I left for the day and came home to 90% humidity and 90 degrees in the cool side despite that I had been using the IR gun and getting significantly lower readings earlier. I lowered the thermostat and added 1" or so of aspen bedding instead of paper towels and also added a rock and some foliage. I'm still waiting for the temp/humidity to normalize with the added substrate, but he's still cruising his tub and trying to escape. I will see how it turns out tomorrow. I'm very stressed here over his stress levels.