I'm getting ready to move them to the dry, closed coop but the nights are going to be down in the mid to upper 50s (days will be warmish). The last brood did fine out in the coop at 5 weeks old but was a bit warmer a couple of weeks ago. I have had their brooder lamp off this week to 'acclimate' them to no heat source but inside it never goes below 70. Is this ok? I really can't stand the little buggers in my bathtub another day!