I am in the middle of a freezing, snowy winter here in upstate NY. My chickens are doing very well in an insulated coop with no heat or extra light. Amazingly, right after we hit the shortest day, I started seeing an increase in egg laying...I have 24 RIR's, by December 21st I was getting just over a dozen eggs a day. Today I had 18, and I wouldn't be surprised at another egg or two when I close them up tonight. I am really pleased. Not sure if it will decrease again- we still have plenty of winter left. Also, right around that time we built a "sunroom" addition on the coop. Now, the girls can get out into the dirt and air, no matter how awful the weather. Maybe happier chickens really do lay more eggs! Anyone else notice more eggs, since Dec 21st?