I have a metal shed that is my coop. I am putting up radiant barrier stuff, its a silver roll and works great instead of insulation on the ceiling and 3 walls. How do you let them out in their run or to free range and them to be still able to get into the coop w/o air flowing inside? Do you think I need a heat lamp of some sort? I have 24 birds, and 1 is a turkin. I live is SW PA, who knows what winters hold for us. Last year we had about a 2 week cold spell and other than that it ranges around 34. I have a cement floor and have it covered with straw, which in the winter I will put it on thicker. Thanks for all the help. I know there is a lot of questions on winterizing but wasnt sure on a metal/tin coop.