Hi! I find your mention of heated nest box very interesting. Could you please tell me more about that? We have pretty mild winters here in Eastern NC but just had a hard freeze AND snow about 2 weeks ago, took days to melt away with temps in the 40s. This week we're having 60s daytime and 40s at night....my girls hadn't been laying since at least Oct/Nov and are 13 3 yr old hens. Saturday was about 65° so I spent the day doing overdue cleaning and found about a dozen eggs! Three were in a feral cat box I have set up, elevated off the ground with straw and a plastic door flap-my sex link has claimed that one. The others were in my metal rolling nest box that had green fake grass pads but some rolled into the metal hopper like they were supposed to. Yesterday I actually found one freshly laid in my wooden nest box. My olive egger and at least 1 leghorn are laying, the rest were all medium brown eggs and could be from several different girls.
So, after all this background info, how can I proceed with heated pads? Which boxes should I use them in? How many, or is there a long one I can put in the metal hopper tray? Or are they small enough to go in each box? Where is a good place to buy them and should they be put on a timer? Yes, I have power in my coop, although it's on a heavy duty extension cord with 4 outlets.
Thanks for any info...I'm intrigued and anxious.
 P.S. how do I know if that doz eggs are safe to eat and should they go in my fridge instead of on my counter? Our house stays warm.