I'm going out today for like 4hours. I'm worry about my chicks. Today is so hot day. It will be up around 87F. House is 72F right now but it will be up to 75-77F ish by the afternoon. If I keep light on for my 1 week old chicks, might get too hot for them while I'm gone. But I shut light off then temp drop to 78F in brooder. Should I shut light off or keep on??