Where I live I usually have a couple of months of variant temps of 55-65 degrees outdoors. I usually house my snakes in a shed outside to cool them. However I like to cool at 60 degrees so I jerry-rig a space heater to a thermostat. I go through this trouble only because I live in an apartment so I need to make the best use of my outdoor starage area. I've read that it is possible to cool in the fridge but you must keep opening the door so the snakes can get air. I imagine you can only cool one pair at a time in there. Best of luck!