i think the only reason you need to close the coop and or run would be the predtors that might get them so depending what killers you have a lurking would base the need to close them. i too dont shut my coop or run door but im deep in the city and we dont really have no over head killers just some wild cats and I am hoping i have that taken care of now knock on wood.well i got 5 used hens, so that brings me up to 7 now to heat my coop.. darn things spend most the time underneeth it tho! heck it was only 10F out and they were all underneeth it!
at night the all roost outside on a branch for a while then go into the coop, i dont close the coop, the opening is big enough for a chicken to get in and out, is it bad not to close the coop? i like ot keep their water outside so they dont get it spilled inside, the go in and out, lately i been leaving the run open also, so they can come and go, i have a creek behind myhouse they can drink from if i forget to change the water.. we got snow today so only one ventured outside the run area.. and that was one that slept under out inclosed porch last night for some reason! crazy chickens.