Actually placing a warm spot (heat cable, pad ect) under the far end of the encloser and keeping the snake in a cold room is perfect for your situation. And consiquentially the best way to keep north american colubrids with possibly (maybe) the exception of montane specimens like Mtn Kingsnakes..
I don't espouse to keeping snakes in a heated room. I keep all my snakes in an unheated, uninsulated room with heat pads or under cable heat on the far end of each encloser. Sometimes it gets down to the 30's with 40's during Feb.
Unless you feed them the snakes will sit on the cool end all winter BY CHOICE. Feed them and they move to the warm end to digest their food. After they finish digesting they move back again to the cold side to conserve energy. Who would have ever guessed they know how to thermoregulate and brumate themselves!! They also will eat even eat though they are very cold to the touch. This is how they are in nature. They eat then choose a warm spot-diegets-move to a colder spot to conserve.
Keeping snakes in a room heated to 80 degrees or whatever, is in my opinion not good for the snake because they cannot get warm enough to properly digest food (80-85F)and they can't conserve energy when they are to warm. I know a lot of people keep their snakes this way and unless you live in South florida I think it is a mistake to keep snakes at a constant temerature by either broumating (cooling) or heating the entire room. It is forcing the snakes to do what we think is best for them instead of letting the snakes choose what is best. the old method of letting snakes live in constant 82 degrees is not what the snakes would choose. Nor FORCE cooling them for 3 months during the winter.
Snakes are always looking for the optimum temps and humidity. That is what they do. Giving them a choise like this is really the best for the snake and incidentally it helps you do not have top worry. Will keep your snake in great health! I highly reccomend this to anyone who is using just a heated room for their snakes.
So Terry if you have never tried this i can assure you your snake will be better off with staying in a cold room, basement, garage, outhouse ect. Than keeping it in complete cold or warm temps by heating or cooling them. Cold room plus heat (hot spot-cable-pad ect) on the far end WORKS REAL WELL! Plus you don't have to worry during your extended absences.
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