[Cazador]

I should have mentioned that I checked on the snakes in the garage about an hour before I opened the door. Within 1/2-hour of closing the door, the snakes were dead. I imagine that unless it's bitterly cold outside, just opening and closing the garage door to get your car in or out wouldn't have the same effect, unless of course the snakes were near the door (I know... it goes without saying).

Now I keep them downstairs in a storage space with a concrete floor. The temp stays pretty steady in the mid-to-lower 50s.