As long as you can maintain their environment, even through power outages, this should work in theory. And replacement bulbs for the lamps, because they will be on 24/7 for months!
The type of brooder I really like is one that hovers and maintains that proper temperature locally, but allows the chicks to move outside that if they wish. It simulates a mother hen. Naturally brooded chicks can be outside in cool temperatures, if they have their mother nearby to warm up under. In a frigid winter, they can roam the shed or garage and duck under the brooder. My chicks this year really loved the bricks I put in under the heat lamps!
The brooder temp starts at 95 degrees for newly hatched chicks, and drops about 5 degrees for each week until the temperature inside matches the temperature outside. If the weather is warming up significantly, you can fudge on this, but if it is getting *colder*, you can't.
You need enough enclosed space for all the pullets-- depending on the breed, they are nearing their adult size at 5 months (the approximate laying age, though that varies wildly between breeds). I was taken off guard with my set-up this spring. It was waaaaay too small because I was expecting warmer temperatures we just weren't getting. What a mess!
You need a generator, but I'm guessing a lot of folks up there (technically down from where I am, but, anyway....) have one on hand anyway.
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