We live in MN, so I am planning ahead for this winter. Our coop should be almost fully insulated by winter. It is also inside of our garage. My questions is what to do on the days when the temp is in the extreme negatives? ( like -15 and lower) I only want to use a heat source when only necessary. What is the best and safest option? I plan on getting a heated dog dish for their water. I should add that we have 6 girls. One has vision problems. They are GSL and doms. Can they go out in the run ( with snow) if the temps are not too bad? Will they even want to? If you can't tell this is our first time ever with chickens. They will be about 8-9 months old by the time it starts getting cold.