I do not do have a heat lamp or a light in my coop! i let my girls have a break from laying! I have enough eggs! I read something somewhere that said if you have a heat lamp and your chickens are used to the heat and your electricity goes out and you can't jump start it, and it's -10 out or lower, your chickens could die because it's a big drop of temperature in the coop! That is the 1 reason i don't do heat lamps but the other is, the chickens are capable of keeping themselves warm during the winter!
I hope this helps you!
I hope this helps you!