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I don't know what temperatures you currently have them at (or what heat source) but you can reduce the heat in the brooder as well as taking them out for an hour or two as long as you have a coop or run ready to go so they stay safe and have some option of shelter. Gradually increase time...

They could already be living outside full time today, no heat, if you've been aggressively weaning them off heat and exposing them to outside temps. 4 week olds can handle 40s just fine as long as they get acclimated to it and have dry, draft free shelter as needed.