Hello all!

I own a small acreage and am missing having chickens as we did when I was younger at the farm. I'm only interested in buying two or three pullets (Buff Orpingtons as they are supposed to be well adjusted to cold weather). With only a couple of chickens, I was intending to build a chicken tractor with 4'x8' open area and a 4'w x4'l x 4' enclosed coop (over top of the open area).

My dilemna is:

Is this a big enough enclosed coop for 2 chickens? Keep in mind that during the cold winters, they will probably spend all of their time in there.

Should I try to insulate the enclosed coop, or with two chickens and a smaller heat lamp in such a small space, would the poor girls overheat in there?

What is a good balance between proper ventilation and proper insulation in such cold weather (We regularly get -30 to -40C in winter here.

Does anyone have experience or advice with wintering such a small number of chickens in a chicken tractor?