I am going to be buying my son a ball python for X-mas. I am currently getting the terrarium together so that I can ensure that it is working correctly before getting the snake. I keep hearing mixed advice on what I should do regarding heating. Guys at work told me to just throw in a heat rock and your good to go (I won't be going with this advice). Anyway the advice that I'm leaning towards right now is to put an UTH under a 3rd of the tank and hook it to a thermostat with the probe inside of the warm side hide. One issue I have is choosing the thermostat. I have reef aquariums with live coral and have learned the lesson of using cheap parts and then paying the price later. So I want to get the right thermostat now. Then the other issue I have is that I live in Colorado where it can get pretty cold in the winter. In my house I typically run my thermostat at 64° during the day on weekdays and every night, then run it at 67° the rest of the time. So given the ambient temp in my house I am concerned that the 16W UTH will not be sufficient. What advice do you guys have?

Here is what I have so far: