We have a radiative heater (like the one above) in our coop which we turn on throughout the colder months. My husband is always extremely worried about fires starting, so we blow out the coop and heater regularly to prevent dust buildup.
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We also make sure to use a clamshell extension cord safety cover where the extension cord and the heater cord connect, so that the plugs don’t get dusty. We keep our heater set to 50°F.
We don’t let the chickens out of the coop until the temperature is above single digits outside. We find that anything below 10° risks frostbite on our Welsummer’s comb. I haven’t had to worry about my hens struggling with the transition from indoor to outdoor temperatures, they handle it just fine.
In their run we have a 48” x 20” seedling heat mat, connected to an extension cord with a clamshell junction cover. We put it in a place where the girls love to stand, and they huddle up on it and keep their feet and bodies warm. This has worked for over a year without issues, and we got the mat for $10 on a cyber monday sale on amazon. Totally worth it!
Our run is covered and is a barn with the floor removed and the walls replaced with hardware cloth. In the winter we have polycarbonate greenhouse panels that we temporarily affix to the exterior to block the wind at ground level. They work great, and it almost made me happy that the wind tore our kit greenhouse down within days of finishing its assembly, because the rails the plastic panels slide into can be screwed onto the studs of our chicken run and the panels can be slipped in and out as the seasons change.
I also have an app on my phone that wakes me up if there is a power outage. In an emergency we would bring our six hens into the house and set up a pen in our living room. We do this during tornado warnings already, so we’re all used to it.
For reference, we live in a place where the lowest temp we’ve experienced is -8°F. We get snow once or twice a year, but never more than a few inches at a time.