I am trying to figure out the best design for a hen house (4-6 chickens) for a cold climate. I was wondering if I should build a coop that is above the ground- all the pictures I have seen have the coop 6" to 3' off the ground. My concern is the insulation in the winter-closer to the ground means warmer up north! Why are the coops off the ground- is it predaors? Can I build it close to the ground for insulation purposes? Help!