Hey Y'all we live in the city of Charlotte- Have a 4 X6 playhouse-style coop that is pretty much more holes than walls (ok well big windows covered in heavy gauge hardware cloth) to allow for as much airflow as we can during our hot summers. Now the temp is dropping and I notice all our girls sleep together in the nesting box. How much warmth do my 4 (23 week old) BO gals need? We don't have the coop wired for electric...It is not insulated but has a solid floor covered in linoleum and walls are 3/4" plywood. We use pine shavings for bedding. The have an attached 8 X8 run. Should we cover the windows for winter (still have vents along the eaves on top)? I was thinking of sliding plexiglass over each window so it could be slid up on warmer days to allow the coop to vent, but that it so pricey...DH wants to bolt plywood over the windows til spring- Ideas? Advice? Thanks everyone!