I feel a little better now. It was really worrying me, but I'm a worrier. It seemed like almost half the snakes were laying for hours in their water bowls. And if they thought that would warm them up, they were in for a big disappointment. It is ok for them to get down to 42 degrees? My basement has an old coal room. It is large enough to get all the cages into after being scrubbed and painted. I have insulated it from the rest of the basement so that it doesn't get heat from the furnace. But the ceiling is only 7 foot and I think you have to hit 6 to get below the freeze line. I figured that the temps will keep at around 50 for most of the winter there. There is a closed-off window that I can use to ventilate if it isn't cold enough. Somebody please tell me if I am doing the right things. I know I am acting paranoid.