I can't stress this to you enough. With almost any UTH on the market, you NEED a thermostat or a rheostat!
However, your probably not going to be able to keep the ambient temperatures in a cage that large. Is your ball python big enough for the requirement of that enclosure? If not, I would suggest downsizing, considering it's harder to keep temperatures and humidity the bigger the tank is.
What are you using for substrate? Do you have a lamp, which could aid the ambient temperatures?