Someone is coming to take care of them twice a day and we have about 20 chicks. They have a fairly big area and they just run around and play like little chicks do. At night if they don't have it they seem a little cold though.
I am in northern WI and they have most/all of their feathering is grown, they are outside. It only gets down to 60 ish. We are going on vacation tommorrow for a week and a half so think after we get back we will take away trhe heat lamp