I am in Iowa and am in the process of finishing up building our coop. I was hoping for outer wall nesting boxes but my hubby is unsure. I am attaching a pic of the current build (old hog farrowing building we cut in half). if we do outer nesting boxes should we insulate the box frame also? the part the sticks out... Or with the iowa winters should we keep them inside the coop? The side the boxes is going to be on is the east side which gets the least amount of wind and pounding. Also, at which point do we need to add heat to the coop during the winter months? I plan to insulate the ceiling and walls next.