This past winter (2015/16) I had some pine shavings for bedding (now I got straw). We also put in the foam insulation you can buy at Home Depot and we covered the foam in duck tape - because believe me, chickens love the Styrofoam! I made sure to allow ventilation in the coop because, it is true, when the coop is nice, dry, and warm, they will tend to resort to that option and when they are in there they still need fresh air and air flow so they can still...well...live. I have heard of others sticking the clear and waterproof shower curtain protector or a tarp on the ceiling and at the walls of the run so snow banks won't fall into the run. There's nothing like the outdoors and I think doing this will help your chickens a great deal. (I don't know about you but I sure wouldn't want to spend my whole winter cooped up (no pun intended) inside
Having camped many times, camping could not be more miserable than when it is wet and when I am not prepared. Be sure the coop is water tight, but not air tight. Your chickens still need fresh air to come in and bad air to go out.
That being said, chickens are tough! They can withstand many a cold night bundled up on a roost or in the nesting box next to each other. I for myself have, do, and will continue to use a heat lamp because when the days are short and cold, it supplies supplement light for increased egg production and very nice heat. I have heard from quite a few chicken owners that the heat lamp is bad and by all means, it can be, but I have it clamped to a 2x4 up high and it is a fair distance away from the floor where the bedding is, and from the 2x4s where the wood is and it works just fine. Just be sure you won't have anything close enough to combust, because if it is close enough, it will. So be really really careful with a heat lamp. Oh! And one more thing - to keep your chickens busy, throw in a bit of cracked corn or oats. Chickens love their food and digging and scratching is a great way to get rid of boredom!
But yeah! There's my two cents. Hope that helps.

That being said, chickens are tough! They can withstand many a cold night bundled up on a roost or in the nesting box next to each other. I for myself have, do, and will continue to use a heat lamp because when the days are short and cold, it supplies supplement light for increased egg production and very nice heat. I have heard from quite a few chicken owners that the heat lamp is bad and by all means, it can be, but I have it clamped to a 2x4 up high and it is a fair distance away from the floor where the bedding is, and from the 2x4s where the wood is and it works just fine. Just be sure you won't have anything close enough to combust, because if it is close enough, it will. So be really really careful with a heat lamp. Oh! And one more thing - to keep your chickens busy, throw in a bit of cracked corn or oats. Chickens love their food and digging and scratching is a great way to get rid of boredom!
But yeah! There's my two cents. Hope that helps.
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