I am a new chicken hobbyist in Maine. I got 8 chickens (2 NH red, 2 Buffs, 2 Golden Comets, & 2 Ameraucanas) back in May and built an uninsulated, raised 10 x 8 coop. So far the chickens have been doing great but I'm concerned about heat & ventilation in the coop this winter. Recently the temps have been dropping down into the single digits (0 - 9 F) at night and that will probably happen on a regular basis for the rest of the winter. I buttoned up the coop as much as possible, have a 60 watt bulb on a timer (3:30 am - 7:30 am) over their perches and am using the deep-litter method but I have recently noticed frost forming on the ceiling and the walls. I am assuming that I buttoned things up a little too tight and their breathing is causing the condensation. So here are my questions: 1) Should I remove the styrofoam insulation that I used to cover the vents in the eaves of the roof? This would increase the ventilation and get rid of the frost but would also allow for drafts in the coop. 2) Do I need more than a 60 watt bulb if the temps will be in the single digits? I've read a lot of differing opinions on this one and am thoroughly confused. Thanks in advance for any suggestions.