>>I'm told that rubber boas do just fine without heat sources.
>>
I almost forgot about the lovable rubber boas.
>>Other than that, conventional wisdom says almost all snakes need heat sources, but that is up for debate depending on the temps you keep in your home. I can't really afford to turn up the heat, and live in an apartment with many drafts, so I give my snakes heat lamps. However, I did some experimenting this summer, and found that my snakes were fine without heat; but that was summer. In any case, I can't imagine a North American snake that would be harmed by temps between 70 and 77 degrees F, so you can pretty much take your pick. Corn/black/yellow/Everglades rat, king, garter, and probably bulls and pines (I don't have any pits) should be OK in that range.