I am thinking about the design of my coop and was wondering about nesting boxes. I like the idea of having them sticking out of the side of the coop to allow more room inside but was wondering if this would not be smart in a cold environment? I am in Vermont where is can get to -20 at night. I guess I'm not really expecting to have my hens lay when it's winter anyways, so maybe it doesn't matter. Thoughts?