Brad has a point i have my AC on all the time and at night it gets pretty cool. It is ok however for a ball python to experience a temp drop at night like they would in the wild but its really not that important. Make sure you get a night time bulb for that clip lamp. But other wise it look like your all set.
How old are you any way?
Its great to see someone who is willing to be prepared. I have known people who have bought a snake and then said what am i going to put him in. So its nice to see someone taking the extra step. And you were off to a great start the second you registered at this site.