IMO, as long as the temps during the day are in the 30's -40's, they are too young. You did say you would keep the heat lamp on at night. If you have time to visit them a lot during the day, you can try it,and see what their body language is. You may end up using a lamp 24/7 for a few weeks outside.
x2, but they should be fully feathered first?? Head, chest, belly, and back.Were yours older when you got them? My 4 week olds aren't even fully feathered yet(almost). I know people that start them out as peeps in barns/coops, but with the 24 hr. heatlamp's.
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