KristineY
Chirping
Our four coops are not at all insulated. Have had only one issue with a rooster who suffered a frost bitten comb during that vicious cold last winter. (I'll be more diligent with Vaseline on the combs this year). We use the deep litter method with straw and I think that imparts enough warmth (along with the chickens throwing off their own heat). We used 3/4 plywood on the floor and 1/2 inch wall sheathing.