I put my girls outside at four weeks old because they were goin crazy in their crate in the garage. I have four golden comets. At frat they were skiddish and using the ecoglow 20 a lot. They are 6 weeks as of Friday. I went to check I them and they are all happy huddled together on the roosting bar sleeping nicely! They love their coop ad their roosting bars. I'm happy they transitioned well. I still have the ecoglow in there just incase. I was thinking I can completely remove it in the next two weeks. Just happy they are doing great, growing fast, and seem like happy chickens! They aren't the friendliest cuddle bugs, but they are pretty good.