I live in Eastern NM and built my coop with old pickets pushed flush together. There are some gaps here and there, but I had read that there should be ventilation. I concluded this will suffice. In the winter it can get really cold for 3-4 days, but can then warm back up to 50's-60's during the day. If you are in the area or something similar, do you think the pickets will be too drafty, or fine? If too drafty, do you have suggestions?