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Chicks can regulate their own heat pretty early. They will, however, still get too cold before they are fully feathered ... anything from 4 to 8 weeks.
So, it depends a bit on feather cover, and yes, on where you live.
I'm in OK ... my 5 week old BOs are feathered and probably need no heat now. I'll wait until this week's cold overnight is done (tonight) before turning off the lamp.