I hooked this up in my new coop and am thrilled at the heat it gives on on the lowest setting. When I put my hands on the front, it was hot to the touch. The temperature was hovering around Zero Celsius and the hens stayed warm and laid eggs in the morning. I mounted it on one side of my roost. I imagine the pecking order will take over as to who gets to sit closest to the heater. I will let you know if I need to hit the high level when it is sub zero here in Canada.