I've used the heat cable with a T3 for a while. I had problems at the start but once it is stabilized it works pretty well. As April and Christie said, no night drop necessary. If you dont want to purchase a proportional, there are a couple of good on/off types out there. Johnson and Ranco specifically. Get in touch with Matt at MG Reptiles and he will hook you up (www.mgreptiles.com). Welcome!
Jamie