Can anyone tell me if it is necessary to keep a heat lamp in the coop? We are in RI and it is starting to get cool at night now and we are starting to think about winter. It doesn't usually get much below 20s here in winter but I'm not sure what they can handle temperature wise. We have Buff Orps, the coop is 8x8 but it is full height (6-8') not insulated and it is raised approx 6' off the ground. right now there are 25, but we think there are about 10-12 roos so my guess is we will probably only keep a couple so we should have 12-15 chickens in there thru the winter. do we need to run the heat light or will they be fine without it. I tend to go overboard, and my DH says they will be fine without it, I can't help it I just turned the light on for them now and it's only supposed to be 40 tonight.