I use under belly heat as well. However, I also have a boa, ball python, and frilled lizard in my room which cannot handle drops in temperature too much below 75. I like to leave my windows open in the winter (i'm a cold fan ha), so I had to find a way to keep them warm. I've separated my room into half with thermal lined curtains and run a radiator heater on the side the critters are on. It stays around 75 degrees in here at night, 80 in the day. It works well and everyone seems happy.