It's finally getting chilly in Texas and I'm wondering about heat and winter ventiliation. I currently have a red heat lamp in the coop and it keeps the coop around 60 w/ night temps in the 40's but when i turn it off the coop only gets about 1-2 degrees above the outside temp. Are the hens able to sleep w/ this red light on all night? Is it bad for them to have 15-20 degree swings overnight if I don't keep the heat lamp on all the time? How cold is too cold for chickens? I currently have two inch holes drilled all the way around the top of the coop. I feel like this might be too drafty during the winter. Their roost runs east to west inside the coop. Should I close off the vent holes on the north and south side or the east and west?