We built our coop without an egg door. We have a pop door (12x12) and a people door (24x16). Everything is double-walled and insulated. My hubby thought that a single-layer egg door by the nest would be too cold. I didn't think of it while we were building the coop, but won't opening a 24x16 door every day in the winter make the coop cold, too?!? Was this a foolish mistake? We could add an egg door, but it will kind of be a pain to do it now. We live in MN. I just want to be sure that our hens aren't going to freeze in the winter if I open the big door every day to collect eggs.