My chicks are 3 weeks old now and are currently in an interior room that is not cooled. I moved the light up and down or turned it off for a few hours depending on their behavior previously, but I started to get concerned with the room getting too warm while I was gone to work now that they are older and our temps are heating up. So, I put my heat lamp on a timer. It is a reptile ceramic bulb, so no light going off and on to bother them. It comes on for 30 minutes and then goes off for 90 minutes. This cycle just keeps repeating. So far, it seems to be working out great.