It's getting colder in north CO! I had planned on getting this coop wrapped with insulation, but once I got far enough to have them inside, the summer beckoned with a million things, and now I'm looking for some band-aids. I designed this coop with lots of ventilation in mind, but now I'm worried about draft. The roof has exposed rafters, letting the air flow from the low (north) side to the high side, so just yesterday I blocked up the the south side some, going to put up a baffle on the north side so that air can flow but no "blow." I'm thinking about some sort of flap/curtain in front of (behind?) the poop door so they can come and go during the day without the breeze blowin' up their bloomers. I have heard (either here or from a local?) that chickens won't go through a curtain like a wool blanket. Is that the case? Should I cut overlaying strips and sew them back on, kind of like the vinyl curtains on commercial walk-in coolers? I also need an easy way to insulate this 1/2" plywood nest box that hangs off the south side so they aren't so cold in the morning going in. Maybe just a wool cover for this winter, work on rebuilding to accommodate pink board next year. I understand that birds can take down to 12° or something rediculous, so I figure as long as I keep a heatlamp on at night and the water's not frozen in the morning they should be alright. Just to make it a little worse, we lost three of our seven to a fox a couple of days ago, so now four little birds have to try and heat a giant 6x6' 4&5' tall coop. Should I rig up some kind of partition to make the space smaller you think? Maybe even just semi-enclose their roost and put the light there?