We live in Utah and the winters get pretty cold with snow, but my chickens do great year after year. I can give you some tips.
Chickens can handle very low temps as long as you make sure they are dry and free of drafts. It doesn't matter how you accomplish this. You don't even need a fancy coop, as long as you meet those requirements.
To make things even better, you can get an inexpensive watering bowl that heats the bowl just enough to keep the water from freezing. It doesn't use much energy. If you can't find one, you can get one online. There are more expensive ones just for poultry too if you want.
A heat lamp is great, hung up inside a shelter of some kind. The birds can huddle underneath it when it gets very cold. Look up chicken winter care on the internet for lots of great ideas.
Chickens are definitely happier in the winter if they can still scratch around. I have seen inexpensive runs covered with clear plastic to let sunlight in and keep the ground dry. Some people have made frames from PVC pipe and covered them with plastic or tarps. It doesn't have to be complicated or expensive. I put some timothy hay on the floor just to give them something to scratch in. I add another layer every so often, and rake it all out when spring comes along. It makes great compost!
Sometimes, just to give my hens a little relief, I cook up some rice and soak it in a little milk. I serve it to them warm, and they act like they appreciate it a lot. Yes, mine are spoiled little things
Hope this helps.