I'm north of Dallas, it was 14 degrees when I took care of the chickens this morning. It won't warm up until Friday. I had to change out frozen water in the coop, and the girls did not come out at all yesterday. So, I was needing a brooder lamp for April when my 4 babies come, and I am getting it today and putting it in the 4x8 coop to keep the girls warm. Will only run it when we are under 20 degrees.