I just started feeling that my girls are safe and secure. I have reenforced coop in all possible ways. I have battery operated small motion lights that only come on with very close direct movement. These are great for those times I need to check on them when's its dark. I also noticed once one girl didn't get on the roost before dark and when the motion went on she jumped right up. Any way so now here comes the bitter winter. I have read so many threads and no heat seems the best way to go. I have 3 vents in the coop. I know you have to leave them open to keep the moisture out. But should I leave all 3 open? It is going to be 9 tonight. They are all above the roosts.