I currently have a small flock (7 hens and 3 roosters) which will be expanding very soon to a total of 18. My girls are now housed in a coop with a large run, but with the addition of the new peeps, the coop will be way to small. Also on the property is a bank barn which has a dirt floor and stone foundation. My question, I've been contemplating moving the whole bunch into the barn but it seems to be very cold and drafty in the winter. There are no other large animals living in the barn so no one to help heat it up. Also, I am concerned about rats. Does anyone have and experience and or suggestions on converting a portion of their barn into a usable chicken house? It seems REALLY stupid to build another exterior chicken building, since I have the use of barn's basement.