They have nest boxes on the wall and the floor. Unfortunately, they prefer the floor boxes. One in the back corner to be specific! Will this cause any problems aside from frozen eggs?
If you don't have any heat in the coop and you don't collect eggs multiple times a day during cold weather you will risk and potentially have frozen eggs... During moderate temp days if the sun is out the thermal heat from the sun will likely keep the coop warm enough to prevent freezing eggs, or you might get lucky and broody bird will keep them warm, but all bets are off if the sun isn't out and/or the temps drop... This is the #3 reason for me heating my coop...