Idk if it's just me but I've heard of and read a lot of people saying that they like to keep ambient temperature at like 75-80 degrees and nothing lower. FOR me I have kept my ball pythons at 90 degree hot spots with 65-75 cool spots (fluctuate between day and night) without any problems: RI, feeding, etc. Some people might call me crazy, but I have kept these conditions for 2-3 years and my ball pythons seem to be doing fine.