Hello and Welcome To BYC! Depends on how old the chick are. Chicks should be at 95* the first week and you can drop it 5* a week as they get older. So depending on how old they are, you should eventually be able to turn it off during the day at first (now if they are 3-4 weeks) and then eventually during the night. You might also like to check out the BYC Learning Center, lots of good articles on all aspects of chicken keeping. https://www.backyardchickens.com/atype/1/Learning_Center