I was looking at coops to buy or build when I remembered I have this big shed that I was thinking of getting rid of. I'm looking to only have about 4 silkies. I plan on making a big run around it with netting on top. Anyway I was wondering will it be too big? I'm wonderingif it will end up being too cold in the winter even with a heat lamp. I could put it directly on the side of my house where there would be 2 6 foot fences blocking wind and then the house on the other side. But still... here in NY this winter we've had many many days below freezing. I want to do right by my future chicks. It has 2 sliding metal doors on the front. Thoughts?