I live just outside Ottawa, Ontario - in Canada. Our Winters can get -35 and colder some nights. Last year was our first Winter with the Coop and we have it very well insulated and vapor barrier...ceiling, floor, walls, and the main door. My girls did fine all Winter - without electricity or added heat. As for the water, I would bring in the waterer at night, and bring it back to the coop in the morning. They also eat the snow to keep hydrated... So, I'm not one to encourage electricity in the coop - ours did just fine. They are essentially walking "duvets"...and to top it all off...the egg production never slowed all Winter. Amazing!