Well....I finally got tired of smelly chicks in the house. They are four weeks old and nearly fully feathered. They are running around inside my open front greenhouse, and then they have a insulated box with a heater in for night or if they get cold. Now my problem is getting them to discover the box!!!!! Not sure how to accomplish that yet! How warm do you think I should keep the inside of their box at night? I have weaned them off of light for about a week now, but not heat yet. I know that it is going to get down in the forty's here at night, but at what age is this ok for them? I can't seem to get a clear picture from the posts I've read when they are good to go without heat at all in 40 night time temp. What do you all do?