I've got a little female red-sided who only comes out after the heat lamp has shut off and temps are down to about 69-71F. I'm experimenting today with using a CHE for heat to see if maybe it's the light she dislikes. However, as has been pointed out to me, this subspecies ranges pretty far north and I have to consider if maybe she just likes cooler temps like this. I find it hard to believe that they would like things that cold, but crazier things have happened. Any other red-sided keepers out there that have found that their snakes like it cooler/darker?