I live in West Central Ohio and the winters get pretty cold. There are normally no extended periods of temperatures below zero but there are some days and maybe several in a row. My question is that if I have a heat lamp in the coop does it have to be directly over the area to be warmed? The coop is small about 5' x 5' x 5', just right for the four Brown Legherns I currently have. Would a lamp hung in the middle of the coop put out enough heat to take the chill off during the coldest of days or should it be directly over the roost area? I don't want to risk frostbitten combs. Any input will be appreciated.