I think thermostats are perhaps the most important piece of equipment necessary when it comes to keeping snakes. It's amazing that pet store employees don't give this information to buyers.
Snoop- Once you get a thermostat and your husbandry is dialed in, and increase the prey size for your snake, you should be just fine. Here are a couple of t-stat options.
http://www.amazon.com/MTPRTC-ETL-Cer...arm+thermostat
http://www.amazon.com/Herpstat-Intro...tat+thermostat