- Do adult birds need additional heat (heaters, heat lamps) or not and if so, when? I.e. when is it TOO cold?
No, they do not need heat. Chickens convert food calories into heat energy similar to wood and gas burning produces heat. It's never too cold for chickens as long as they're adequately fed.
However, I had a sick hen who had trouble completing her molt and was nearly naked all winter. I put a heat lamp in the run (sand, so no fire danger) so she could warm up under it. But at night, she sandwiched between others for warmth
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- How do you prevent frostbite on your birds' combs and feet?
Keep the coop and run as dry as possible.
However, I have vertical nipple waterers. I block them off from use during single digit days and bring in conventional plastic jug/tray waterers so combs and feet aren't getting wet when they drink.
- How to best kit out the coop (and run) for winter - ventilation, insulation, moisture management, etc.
My coops are insulated. They are vented into the covered run. I do not allow poop to accumulate so this reduces the amount of moisture in my coops.
- How to keep their water from freezing.
I'm trying something new this winter. I folded a small heating pad over the water taps (Bright Tap vertical nipples) and fastened it with string against the Igloo water container. I wrapped water heater insulation around the entire thing and secured it from chicken beaks by slipping a wool bag over it, tucked in around the bottom. It's worked so far as temps dove to 19F. It remains to be seen how it works when the really cold temps hit.
- How to keep their eggs from freezing.
That's so easy. Just pick them up before they freeze. If you work and can't collect them until evening, slip a heating pad under the nesting material in the nest box. Blooie will agree heating pads are good for much more than just brooding chicks.
- Keeping the flock happy and amused when they are confined to the coop by heavy snow, storms, etc.
My chickens have a covered run with rigid, double-walled plastic panels all around to protect from even the worst weather. The roof panels let in sunlight as do permanent glass side panels so the run heats up during the day when the sun is out, and it's often very pleasant in there even when the outside temp isn't fit for humans. The sand in the run acts as a heat sink, further keeping the run comfortable, and helps to mitigate the temperature in the adjoining coops.
As entertainment director, I supply fresh squash all winter long, hang jumbo carrots from strings for them to nibble at, and there are always flock blocks to scratch at, too. No one gets bored. Including me.