Ok, my coop is 8x10, with 8 hens. My roofline is vented front and back (2x4's up on end, that opening is wired over to keep critters out, but let air flow through.) I have the run covered in plastic. So, today and into tonight temps are going to be -20F (that is actual temp, not counting with wind chill). I do not have a heat lamp out there but do have a regular light I turn on. What should I do? Some snow did manage to get in from the roofline. HELP. Are they going to freeze? Here is a pic of my coop, if you look at the roof you can see where the opening is. It is like that front and back.