I am about to start my first coop. It will be a small coop for about 2 to 4 birds. I think i will copy this coop with a few slight changes. The question i have is about heating. I hear lots of people on here say yu dont need heat. Jst wondering if this would apply in very cold climates. I am in southern ontario canada and in jan/feb it is not uncommon to get temps as low as 0 F or even lower. Last year we had a week solid of - 10 f. asuming the coop is ventilated well and not drafty. Would chickens survive this climate??