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I‘m in Northwestern Wyoming not too far from Yellowstone Park. This is my coop and hoop run in winter. We can get wind gusts of up to 90mph, (unusual but has happened) with 60mph being our more normal gust speeds. I do not insulate my coop, nor do I heat it. I have operable windows on all but the north side of the coop. They are always open at least a crack on the downweather side. I also used floor vents, the kind used for forced air heating in our homes, on the upper walls on all four sides. They are also usually in the open position except on whicjever side bad weather is blowing in from. The gable vent above the people door is always open, as is their pop door into the plastic covered run. This has been my setup for the past 8 years. I’ve never lost a chicken to cold, nor had a case of frostbite. Even my Silkies do very well. A small, rated-for-plastic stock tank heater in a 5 gallon bucket fitted with horizontal nipples provides a steady supply of unfrozen water.
i raise my chicks outdoors from the start in a wire brooder pen in the run, even when our springtime “chick season” temperatures are in the twenties, dipping into the teens. I detest heat lamps too, so they use Mama Heating Pad as their heat source. In fact, it’s supposed to get down to the same temps you’re going to experience this weekend, and I have chicks out there right now. Three of them are 2 weeks old, the other 8 are a week old. They’ll be fine. They’ve already acclimated.
I evicted my first indoor, heat lamp raised chicks at 5.5 weeks. That was April 1, 2014. That night the temperature dropped to 18 degrees. The first two days they had a heat lamp, but those 2 nights when I went out to check them they weren’t anywhere near it. They were sleeping in a comfy pile in front of the pop door. The third day, April 3rd, I took it out, and it snowed hard with high winds that night. We got our last snowfall on June 6th. That’s when I realized that THEY didn’t need those arbitrary temperatures - my own peace of mind and the “experts” did. Done and done.
I grew up in South Dakota. I know how unpredictable spring is there, just as it is here. I think your chicks will be just fine. Temporary dips in temperatures are different than trying to contend with the long months of deep winter. They can cope with both quite well, but we, on the other hand, can worry ourselves into quite a state!