Hello, I have 20 isa browns who are 19 weeks old and so far we are getting 4-6 eggs a day. But once they are all laying we are going to be selling eggs. So my question is with winter coming up soon how do I keep the eggs from freezing? My coop is insulated and will have a heat lamp on in the coop but where I live it's usually anywhere from -10c to -35c in winter. So the eggs will probably still freeze. We don't want to put heat pads in the boxes. Anybody have ideas?