A rack really isn't the best option for a room that cold. What you want is a PVC cage. contact Kitedemon (a fellow BP.net member) he lives in Canada and can help you better than I can.

Here is a thread that is about PVC cages. The information is good for most PVC cage brands

http://ball-pythons.net/forums/showt...With-Pictures!

PVC is the way to go. it insulates better than most other materials and is lightweight.