We are hoping to start with a few (3) chickens this spring and I obviously will need a home for them. I've read over and over to build/get something bigger than you think you'll need because you'll want to add more chickens, but I'm not particularly concerned about this, especially as I'm limited by city ordinance. I live in Iowa, so it gets pretty darn cold in the winter. (Last week, it was 30 below.) I need something portable, because the chickens will not be allowed to free range much (we have a neighborhood owl, as well as something that keeps eating pigeons and leaving us the feathers in a pile in the yard). Plus, city ordinance requires they be kept 25 ft away from neighbors. So I was thinking a small tractor (I was looking at Msbear 's design). But then I've read several threads on here suggesting that tractors are too hard to keep warm in the winter? Is this true? How do I combine my need for small and portable with my need for warm in the winter? Worst case scenario, I have a friend with a small acerage and a large flock who could probably overwinter my chickens for me, but I think I prefer to have something that will work out here.