How hardy are wyondottes? Im now concerned that our coop is too secure?? DH put a plywood ceiling in and the 2 front doors to enter the coop,he made one for entry n the other closed for good w/cauling around the drafty spot.(the door didnt open right n could not be replaced.Our coop is 12x12 with 12x8 area for our 3 girls and the rest for storing feed etc.They have 4 nesting boxes(we had 4 girls n lost 1 in aug) and a roo ledge along with bedding of dried grass in n under the boxes n in corners of the floor as that is what they like for bedding and where they like to lay.We do have a side trap door as well that leads to the play yard.The flooring is concrete type backer board.All the walls are paneling and the 2 areas are separated by a 1/2 plywood bottom wall n top 1/2 is heavy gauge wire w/a door in the center.Last year was our 1st winter w/chickens and we did put a small heater out there and set it at 50 degrees,so it only clicked on then.If we should loose power as we have in the past for 5days,then we have a generator or worse case...bring them in the garage..lol..Im out there frequently throughout the day and they go out at 7am n back in at 7pm.My lights are on timers n go on at 5;30 n off at 8pm.Last year I still let them out when it was very cold n snowy,I put vaseline on the combs n waddles.I have been giving them the crumbles w/grit n acv h20 available 24/7 along with scrambled eggs,oats n yogurt alternating 3 x's a week.Safflower seeds as treats and I want to learn more abt "scrath n do that for them.The 2 blk ones are abt 10lbs and the G.L. is abt 7 lbs.So I think Im doing it right as far as getting them ready for the cold,but now Im concerned I dont have enough ventilation after reading all the posts?????? They have a window in the nesting area which is covered w/a sheet as we think thats how the 1 died,trying to fly out the close window to get to the other girls who were outside of the window.I also have a "mini compost of soil n the sccoped poo that I mix in daily when I scoop up the poo.That is in the area where the feed is..Feed on 1 side of the door...soil/poo bin on the other..It is plenty big enough for 3 and we are getting more girls in Feb..We will keep them inside till spring n then put them all together.I dont like the idea of bales of straw or hay as ds is allergis to it n then he cant go out to the coop..Anything else we can do/use to help them keep warm?How else do I check to make sure it is ventilated enough..I never smell the ammonia smell or the poo as I do scoop several times a day.Sorry its so long,just wanted to make sure that Im doingit all right..Thanks for the help.