X2takes a little while for the hens to get used to cold weather. if you supplement heat……and lose power……your chickens may suffer because they are not acclimated to temps lower than 30 degrees or whatever. My hens are freezing at 30 degrees at first, but gradually get used to the cold. the hens do well even in 20-10degrees. I never supplemented heat b/c of what I was taught, and I’m glad I didnt. This will be our third winter and I couldnt imagine worrying about heat plugged in anywhere near them. I was told by the pros here that they should be fine in Connecticut winters, just block the wind. That was solid advice. my hens like the cold, but hate the wind chills and snow and will avoid. All this advice would be modified if any hens are molting. winter Molting hens get extra checking in on, and extra protein for warm and assistance with healthy molt. Good luck winter chickens!!
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The same can be said of bringing chickens indoors. You can't just stick them back outside without some period of acclimation.