The thing is the panels have never gone above 75% power or so, and still never gets the cool side to 80 when the hotspot is at 90 but that's only if the room goes below 70*. I had wanted the next size up for the same reasons you've mentioned but Bob said that you don't actually want to go that route because then the panel will cycle too frequently and in the event that the thermostat failed then you're that much more likely to cook your snake.
I have the probe hanging just behind the RHP halfway down the height of the cage set at 86 and gets me a 90 hot spot on the floor. But if the room goes under 70* the cool side falls below 75*. I just decided to heat the room with an oil radiator set really low and it keeps everything steady. And makes my studio/snake room the coziest room in the house when it's winter haha! More incentive to be in there and get work done or rather be distracted watching snakes hah
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