So, I have been breeding rats in my basement for the past couple of years now and all of the sudden I have developed a mouse problem in my house this winter, which HAS to go away! I'm about 99% sure the mice probably came in under my doors before I had new doors put on my house recently. I'm also about 99% sure that the dog food sitting on top of my rat racks 24/7 is what is keeping them here. Sooo... I am really wanting to move my rat racks out into one of my garages, so I can combat this mouse problem. Can you guys tell me how cold of temperatures fancy rats can survive in? Also, my other concern is, my rat racks have self-watering systems. So, do you guys have any suggestions for keeping the rubber water lines from freezing?

Thanks in advance for any advice you guys can offer.