As winter rolls around every year, we see the same ole familiar posts about heating your coops. I would just like to add my opinion and the reasoning behind it. There is no reason to spend extra money heating your coop. Heat bulbs suck a lot of electricity. I have never heated a coop, my coops are tin or plywood with no insulation or heating at all. In a 6x8 tin coop, I have 13 White Leghorns. These birds are not described as cold-tolerant birds, either. These birds free range from 7 in the morning until they put their selves up at night. This weekend we had about 4-5 inches of snow, 1/2" of sleet and some ice. It was 0 degrees outside that night. When I went out there the next morning, there was no frost bitten combs, no shivering birds, or any frozen birds. I opened up the coop and they all came piling out to play in the snow. I also have another coop with 19, 4 week old White Leghorns. They have been outside, weaned off their heat lamp since they were 3 weeks old. I did not provide any heat for them during the 0 degree weather, and they were just fine that next morning and were ready to go outside. I also own Buff Orpingtons and Sebright Bantams, none have been affected by the weather and none have been in heated coops. The key to this is good ventilation.