Congratulations on your new flock!!!
Chickens are a lot hardier in cold temps than you may think... ventilation and minimal moisture is important, and keeping them from getting too bored. Boredom in a small space (if they don't want to leave the coop in bad weather) can cause some aggression problems.
Here's a link that may offer some insight:
This is a useful link of BYC guides to take a look at announcements-feedback-issues-guides.3 (there's a guide on how to include your location under your avatar - including your location is very helpful). You can use this link to contact members in your area - Find your State's thread.
Hello and welcome to BYC !! We are so glad you joined. You've come to a wonderful place with loads of information and lots of helpful and friendly people. Please share pics when you have time.