The chicks are 5 1/2 weeks and have been in the coop for 2 weeks. Our weather has been crazy - typical for New England. Last night was 22 and 60 this afternoon. This weeks temps look to be 50-60 during the day and 30-40 at night. I have the heat lamp in the coop about 24" off the ground. During the day they run around and go under it if they are cold and they sleep under it all night. Should I be weaning them off the lamp, or should I leave it and let them regulate? I have Barred Rocks and Black Sexlink. They are pretty well feathered, except for a few around the neck area. Thanks!