New Member:

Hello there and welcome to BYC!

The key to keeping chickens warm in the winter is a draft free coop with adequate ventilation. Chickens come with insulating feathers and withstand brutally cold temps if they have time to acclimate to the on coming winter and have good ventilation in the coop. Seal up all cracks around the roost bar so any air can't disturb the bubble of warmth the birds themselves will create. You don't want to suck the heat out of the birds. Have the birds roost low to the floor. Chickens put out a lot of warm moist air all night pooping and breathing. This warm wet air will rise to your ceiling and if has no where to go will fall back down on the birds as water or frost chilling the birds or giving them frost bite. But if you have good ventilation, this warm moist air will rise up and go out the vents keeping the birds nice and warm. You will want approximately 1 square foot of vent space per bird in your eaves or ceiling. Half of the vents on once side of the coop, and half on the other, one vent area lower than the ones on the other side. This will create a positive air flow of constant air going in the low side and out the high side.

Now you can close off SOME of the lower side vents on a windy night to slow the movement of air. But NEVER close all your vents off. The birds need a lot of oxygen and a place for all this warm wet air to go. Keeping your vents closed will also create a bad air situation from the poop smells that can damage their lungs. So let that air fly!!

You can also tack an old towel onto the roost bar to keep the feet warm. Birds lose heat through the feet. So warm feet mean warmer birds.

And if the over night temp is going to be 30 or 40 degrees BELOW your average over night low, then you might add a heat lamp to the birds. You are not trying to heat the coop, only warm up their bubble of air a bit. You can remove the lamp when this bitter cold snap is gone and you return to your normal over night lows. ALWAYS permanently attach your heat lamp to the wall or ceiling and never rely on the clamp. They can fail, fall and cause a fire.

Here are a few threads and articles on keeping chickens in the winter you might want to read or join in on...

https://www.backyardchickens.com/t/822765/winter-is-coming-checklists-tips-advice-for-a-newbie

https://www.backyardchickens.com/t/920320/preparing-your-flock-coop-for-winter

https://www.backyardchickens.com/a/winter-chicken-keeping

You might also want to chat with your chicken neighbors too as to how they do things, the breeds they keep and how they keep their birds warm....https://www.backyardchickens.com/t/72771/minnesota

Good luck and try to stay warm this winter!!