If you need to keep it warm in there overnight, I recommend a ceramic heat bulb. I use one so I can keep it on at night when it gets chilly without bothering the snake (and myself, since the tank is in my bedroom) with light. I have the lower wattage one.. I want to say 65? and it keeps my tank at an ambient 80, though my room is pretty toasty in itself. A higher wattage one could be hooked up to a dimmer to be regulated.