I have lost all of my hens this winter due to the cold. So this year I am "remodeling" my coop. I have the plans drawn out and everything laid out neatly on paper. I know that I will be insulating the ceiling and under the sub floor. But should I insulate the walls even though I will be wraping them with house wrap? If so should I use regular insulation or should I use the reflective insulation I see people using in their home made cabinet incubators? Should I insulate the outside walls of the nest boxes that will be built onto the side? There will be a window for ventilation and there will be a screen door on the inside of the big door for ventilation in the summer and I plan on having four or five heat lamps for heat (my coop will be 10ft by 12ft with a brooder for bigger chicks in the middle) The floor will have rubber floor liners for easy clean up from tractor supply and there will be a built in feed trough and two built in water stands to keep the water off the floor. My coop will be raised about three feet off the ground with a run enclosing the space behind it and for a ways in front of it which will be dug about a foot under ground to keep critters out that will have its own screen door.