For my IJ Carpet Python, I have only a UTH, but I keep the ambient temp in the room around 80-82F (26-27C). He spends alot of time on his climbing branch, but I also see him in different spots around the floor, or occasionally, his hides. So, he does thermoregulate. As was mentioned above, it just depends on your set-up, and what heat source, or combination, will give you the most stable temperatures and humidity...