Thanks for the reply. Sorry I did not state but the thermometer probes are located on top of the glass, directly over the UTHs. The reason I have (2) UTH is because if I do not have one on the cool side, when i check the surface temp. with the heat gun, it measured around 70 degrees. I assumed it was too low for the cool side. I seem to be confused regarding surface temperatures. I thought I needed correct temperatures on top of the substrate, not below. I read in one of the tank setups on this forum (http://ball-pythons.net/forums/showt...ass-tank-setup) that they recommended (2) UTHs with a 30" long glass tank. That guide specifically list temperature at top of substrate. My temps are only a degree or two off of theirs. I know my thermostat setting is high but the actual temperature on the glass bottom is about 10 degrees less than the thermostat settings.

By the way, the temperature in my house is typically around 67 degrees. Most people think our house is cold but we don't like the heat. Even in summer, we set the AC to about 68 at the highest.