The cool side we've been working on. It's been very difficult to get it even to 75. Right now I have a normal light on that side (only during the day) and that seems to be helping without hurting the humidity.
As for the warm side, the only time it fluctuates is when he's in it. I don't know if that makes sense since he isn't making his own body heat, but that's when it goes up.
I know I need to get some better equiptment and it'll be on its way once I get paid next week. He'll also be spending most of his life at school in a room that's much warmer and more humid than my home, so that'll help a lot!