I currently have numerous breeding colonies of rats, and will be forced to move them into a unheated garage or put them all down. They are very prolific having around 15 or more babies per month. I was wondering if they can handle the winter temps in the garage. I live in Arizona it dips down into the mid 30's at night, but doesn't get that cold in the garage. I'm thinking it gets into the mid 40's to 50's as over night lows in the garage, any suggestions? Heating it is not a option.