My clucks were born in mid April and are giving us eggs now on an irregular basis ....but we haven't had much summer here at all and now it's in the 40's at night. The are in a partially insulated coop but the window is open (because I broke the glass trying to get it open) with a screen on it. No predator problems, but I am worried about them being warm enough. Some roost, and some sleep in the nest boxes (i know, I know but it's all about their comfort and security around here.....) and some make big ditch nests in the litter on the floor, some so big, you know there are more than one snugged in there at night. So the question is, do you think they are warm enough? We are in northern Wisconsin/UP of Michigan area.