I have six 7 wk old chicks. All but 2 are fully feathered. It is in the 70-80 range during the day and drops to the 40's and 50's at night. I have a small coop outside with a run just for them when they are ready. It is well ventilated and I am able to fully close it up at night. Are my peeps old enough to spend the night outside without a heat lamp? They have been spending thier days out there for about a week.