The chicks will be 4 weeks old on Weds. When they are in the brooder box, I notice that they pant and also when they rest, they have their wings slightly open (Not all the way open, just slightly away from their body). Is it too hot in the box? I dont have a thermometer. The light I use is just a small table lamp with a shade and 100W bulb. I have left the box open for a little while and ...... ok, well I tried to leave the box open, but the kids closed it. Here are some pics. The box lifts off, for easy cleaning.