I'm gonna strongly disagree here. Your BP, nor any snake, needs a 90 degree hot spot 24/7. All of my snakes get a pretty modest nighttime temperature drop. My house cools down naturally and I also adjust their CHEs or RHPs a few degrees cooler. I'll even turn them off completely sometimes. The ambient room temps will drop into the low to mid 70s and all my snakes do just fine. I believe as long as the snake has access to a hot spot during the day it can easily survive normal nighttime temps.