I use 40 watt red bulbs, and keep my house at 74 degrees. I’ve kept snakes for 35 years. As soon as I got my first place were I controlled the thermostat, I never looked back. My experience leads me to believe 90 degrees is high, they thrive better in the mid eighties. I tried the 90/92 degree, not a fan. Too hot in my opinion. And back in the nineties a lot of breeders were already aware of that. It’s probably why so many struggle with humidity.