Still in the design stage for a new coop. Have looked at a couple hundred pics and read about 10 books on coop building. I haven't seen this issue addressed or I missed it. Using outside the coop nesting boxes, those built onto the coop, how cold can your area temps get to before you have to insulate the boxes to keep the eggs from freezing over night? I'm in southwest TN and night time temps usually drop below freezing starting in Nov. and stay in that range til March. Daytime temps can and do drop below freezing off and on from Dec. to Feb. I plan on using a couple of heat lamps (controlled by a T-stat) in the coop and I'm insulating the coop itself. The coop is going to be a 8' x 8' and raised off the ground about 2'. I'm insulating the floor as well. Do I need to go ahead and insulate the nesting boxes if I mount them outside or should I just build them inside? Has anyone had any problems with frozen eggs using outside boxes? I appreciate any info I can get.