Wattage

Hey so I'm planning on using this as an enclosure for my ball python. It's going to have feet of 11" flexwatt underneath but I'm concerned about ambient air temps as my parents keep the house quite cold so should I, and if so what, wattage CHE should i get for this size tub?
http://www.target.com/p/sterilite-cl...uart+latch+box

The flexwatt will likely not be able to raise the ambient of that space, especially if the ambient is pretty cold as you state. The CHE will help but will only take care of the one space. Your best bet is to get one of the oil filled electric radiant heaters and raise the ambient of the entire room that you plan to keep him in. Also if you should add more later it will have already addressed that as well.

All right thanks for the help :)