We're in Northern New Hampshire. No heat or insulation. I will admit I was shocked to see a touch of frost bite on our rooster when letting them out this morning as it's only gotten to 8 F last nights low. Usually the touch of frost bite isn't until the week of -10 to -30F in January so know immediately something was amiss. Yup, sure enough I wasn't diligent with cleaning the coop. Did that today and added fresh pine shavings to dry it up in there. It's the moisture along with cold that is the problem. Neglected piles of poo were obviously emitting too much moisture. With external attached nesting boxes I don't look in the coop enough to keep tabs on my duties but lesson learned.
ETA: The above poster made an important point. What conditions the hens are currently in you'll want to mimic and slowly adjust them to acclimate to how your going to maintain them. If you must use a heat source try a 60 watt red bulb. with a small coop that's all you'd ever need. Chickens thrive at 30F and if acclimated will forage outside even in winter. At most they want a bit of hay or straw spread in there run if uncovered to walk on the snow and ice. Mine this past cold week keep mainly under the coop so shoveled out the run and spread straw during my maintanence today.
ETA: The above poster made an important point. What conditions the hens are currently in you'll want to mimic and slowly adjust them to acclimate to how your going to maintain them. If you must use a heat source try a 60 watt red bulb. with a small coop that's all you'd ever need. Chickens thrive at 30F and if acclimated will forage outside even in winter. At most they want a bit of hay or straw spread in there run if uncovered to walk on the snow and ice. Mine this past cold week keep mainly under the coop so shoveled out the run and spread straw during my maintanence today.
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