my Silkies have frost on top of their feathers this morning. We were -10 last night with the windchill but about zero in the coop. I have a 2ftx16ft open area on the east wall for ventilation it runs the length of the middle 16 ft section and all other windows closed, none of the coop has frost. I have 16 Silkies in 28ft x 8ft, it is open end to end the long way. Anyone else have Silkies that have seen this. The only thing I can think of is it’s the way they sleep piled up. No one has signs of frost bite or seem stressed. This happened last year that’s why we built on the 8x8 section so they would have a more enclosed area, but left it open to the 16ft area for ventilation. Just not sure what to do. Any suggestions?