I have four 10 week old cold hardy hens. I also built a 4X8 shed to use as a coop for them. The coop is all ready for the ladies, but I am afraid to move them from the comfy garage with the heat lamp. My question is…do they need to heat lamp in the coop? It gets below zero here in Green Bay, WI for days at a time. I am worried about them freezing to death since they are not full grown yet. The coop is built with normal siding board, with one window, but not insulated. I will be using the deep litter method hoping it produces some heat for the ladies. On the other hand, I am worried they will never leave the coop to enjoy the outdoor if I heat the coop. What have you experienced.