I'm new to the forum and new to chickens. We got them in May, I built a completely insulated coop by September, which is when they started laying. I was getting between 8-11 eggs a day. I have 11 hens and one which turned out to be a rooster (not wanted--oh well) When the weather turned cold, I put in a 40-watt light bulb and a heater stand for the waterer. We run the light 24-7 because of the cold. In the past two weeks we've have two major electrical outages lasting 24 hours each. The last one was accompanied by zero degree temperatures and then two days after the outage, the temperature went down to -20. Since then, we've only gotten one-two eggs a day. What can I do to get more eggs? Do I need a heat-lamp instead of just a light bulb? Did the 24 hours of darkness affect them even for several days after? Should I turn off the light for some hours a day? But then I'd have no heat. I have no idea how cold a chicken can survive. My coop is 4 x 8 x 4 with vents but otherwise good insulation and lots of roost areas. I have opened the coop door during the day, but they wouldn't step foot into the snow even when I shoveled it out for them, so I've just gone ahead and kept it closed.