i just bought a heat tape for pipes to wrap around the waterer to keep it from freezing i hope that works. my only issue is that i will have to modify in the spring the coop does not have any southward facing solar access, i am thinking of putting a plexiglass front on the top half of the man door, and maybe cut in some small windows on either side in the walls for more plexiglass covered windows. I have plenty of ventilation i think with six small 13"x13" windows cut up high in the walls that have sliding doors to close during the realy cold days. There are two that stay open by about 4 - 5" all the time. How would i keep my eggs from freezing overnight? because my girls lay at night also.