I have a small flock of pullets, ranging from 17-30 weeks, production red x2, Black sex link, Black Australorp, Ameraucana, Silkie Bantum and Speckled Sussex. Tractor supply where I buy their feed keep telling me that I need a heat lamp for them at night. I was under the impression that I didn't. We live in Middle Tennessee. Admittedly it did get down to 24 degrees last night, but I always thought that in this area we didn't need to heat the coop at night. In fact too warm could be a problem. Grateful for any feedback. Thanks in advance!