We are newbies with a roughly 50 sq. ft. coop that we converted from just a basic outbuilding. The manner in which we got the birds was a bit rushed (to help out a friend who was in a pickle) so we did our best on the fly (and have modified over the course of the year) to put together a coop with a roost, three nesting boxes (which we think might be too small/not private enough because they've been laying in the corners on the floor/bedding), water, feed and grit/oyster shell stations. There is no insulation, three badly-installed windows (installed before we moved in) that are very drafty, some screened openings at the top that we have boarded over and the door to the yard that opens downwind. We have a red heat lamp that we only use when it's really cold. I'm sure there is loads of ventilation now, but I understand that draftiness is not the same as ventilation and can be a problem - we woke up to 2 dead leghorns last year (late winter/early spring) kind of out of the blue and someone told us they are particularly susceptible to wind. They also said mentioned that they keep their coop warm enough by wrapping it on three sides in the winter (with stuff like the plastic wrap they use for pallets of bulk products). So I'm wondering - given that this is the first winter for most of our flock (they are about 27 weeks), one of them is a leghorn, and one is currently fighting some unknown illness - if I should slap up some plastic around the coop (probably a half day's easy work) and remove some of the boards covering the upper screened-in openings to ensure some ventilation (without wind blowing directly on the birds, which it currently does from the windows). Thanks!