i have 2 hens. one lays in the morning and the other at night. there are around 8 eggs out in the coop and the nesting box is a little plastic dog house. about 2 feet by 3feet. and it has a opening in the front and a small vent in the back. the lows are around 26 degrees this week so would it be fin to leave them out side in the cold? would the hens sitt on them and keep them warm?