this weekend its supposed to dip into the single digits and my coop is uninsulated. so far my birds have been ok and its been down to about 12. i plan to put some vaselin on their combs and wattles for when they go outside if they go out its also supposed to snow today and sun. i have a heated dog bowl for their water, but i'm worried they will be too cold. i have also acquired a nice electric heater from work which i may put on a timer to come on at about 2 or 3 am and run it for about 45 min to 1hr. the heater can only run 1 speed and the heat can't be adjusted for temp its like a big square hair dryer. my neighbors have said they will be fine and they have some small 4x4 coops w/ no insulation and just some metal bars over the window opening. they've had chickens for years like this and said have never had problems.