ok, i live in alabama and this will be my first time with my chickens outside in the winter.i want to get a head start on winterizing and keeping my girls warm. right now we have a big pen with a house inside the pen. the house is made of wood and completely closed in except for the opening for the girls to go in and of course we have a big swinging door so we can look in. and of course all the imperfections in it and around the roof is slight opening. so it is not air tight away from cold air. my pen is completely closed in from over the top to the ground with wood and chickens wire. any suggestions????????????