Being in the deep south and picking what is supposed to be a "cold hardy" breed (orpingtons) I hadn't ever considered winterizing the coop. It's fully enclosed, but not insulated. Our winters here are very mild compared to those of some here. This week, we're in the mid 30's. The coldest we ever get is a few nights a year in the upper teens. Can I expect my girls to tolerate these temps without taking any additional measures?