I have 4 Bantams in a tractor style coop in Northern New York. I am concerned about the heat source for the winter months. They need 14 hours of daylight I am told in order to lay eggs. My question is, how warm do I need to keep the coop to and how much lighting do I need to provide the needed hours of daylight? THANKS!!!!! P.S. These are my first chickens, they are very precious to me.