Everything sounds good except where I live the prevailing winds come from the west. I have no ventilation on the west side. This keeps air fresh from the east or southeast but no draft. I use an east facing open front type coop with plenty of eave ventilation and there is little to no draft inside. If you use a heater outside, just make sure that the waterer is draft free as well. Some chickens wont go outside when it is cold and windy so keep it close to the door. If you notice they are not using it, bring it in. As far as molting, they are all different but shouldnt molt completely. It is either a bug or disease or rough roo issue. ALL is in my opinion of coarse.Not sure when chickens molt,,,seen some rough looking chickens at a neighbors house...not sure what the deal was...mite,rooster or molting...still to much of a newbie...Never got this far last year...Mine got whack by coons in mid July...8 and 1 died a day later.Now I have 15 well fed and fat hens that are doing great!!! Getting 13 to 14 eggs a day.Yesterday went 15 for 15!!!!! So Iknow I have no slackers in the group!!! Winter is going to be interesting!!!! I have bushes to keep the north winds down,,,high trees to the west...Coop faces east....high ventilation,,door to get in and out..West has a 18 inch wire opening at the top,,,going tocut that to a smaller opening for winter...What kind of water heater and is it in the coop or outside????? Rather it be outside,,,cut down on the 'girls" making a mess inside.Straw inside on floor ,,pine shavings in laying boxes.Remarks???? Thanks ,,,,Kevin