I am considering getting a very small flock of chickens (certainly at least 3, no more than 6) to keep in my very small yard south of Portland, OR. I have an unused garden shed on the north side of my house. It is shady all day, summer and winter. My intention is to have a run attached (with a litter floor because that area only grows moss and ferns), and to have the chickens able to free range in my yard as often as possible. The building is not insulated at all. In my climate, do I need to insulate the building? Is extra space a problem with too few chickens to keep the building warm in winter? This winter was a fluke with a stint of 18 degree nights - not cold for you folks in Michigan and points north, but that's REALLY cold for us. I'd have brought the chickens into the house for that, but it gives you an idea of the lowest temperature extremes. Thank you very much for any help!