I just saw a really wonderful chicken coop made out of one piece of farm fencing. Wish I could find that link again. You make a hoop and attach it to a frame. You cover the top with a tarp - use chicken wire on both ends and put a small door on one side. Anyway - that would do nicely upstairs and on nice days you could open the doors or windows. I live in the UP of Mi and we get some serious cold and snow here too. I made my chicken door HIGH and put a ramp for summer time. I figure this winter they will walk right out the door... lol
I put plastic on the walls and covered that with plywood - so no rain/moisture can get in - but it's not air tight either.
I have plans for a heating lamp on the nights that it gets really really cold - and it's another reason I chose the breed that I did - extremely hardy in cold weather. I gave up getting prolific layers for extremely hardy.
Since I have stored hay upstairs... you can get "tar paper" in a roll from any lumber yard. It's easy to put down - and will keep the hay from falling through cracks - and help keep the warm upstairs. I did this for our garage/barn. You just hammer tack it down.
I put plastic on the walls and covered that with plywood - so no rain/moisture can get in - but it's not air tight either.
I have plans for a heating lamp on the nights that it gets really really cold - and it's another reason I chose the breed that I did - extremely hardy in cold weather. I gave up getting prolific layers for extremely hardy.
Since I have stored hay upstairs... you can get "tar paper" in a roll from any lumber yard. It's easy to put down - and will keep the hay from falling through cracks - and help keep the warm upstairs. I did this for our garage/barn. You just hammer tack it down.