I bought 6 day old chicks from our farm store back in the middle of March and hatched another 5 on April 1st. I kept the 1st 6 inside for 2 weeks with no heat lamp. They huddled up to produce their own heat, at 2 weeks I moved them outside into a 3 x 3 wire cage. The hatched ones stayed inside for 2 weeks with a house lamp w/ 60 watt bulb on them(only because they were from my hen that was killed and I was trying to keep some of her around). At 2 weeks I divided the wire cage and put them in a third of the cage with the older 6 chicks. I moved them to the bigger coop/run at 4/6 weeks old and they are beautiful healthy birds, loving life. April temperatures aren't bad here in the South but there were several nights that drop down in the mid 40's mainly upper 50's at night and high 60's/low 70's in day.