What wattage bulb are you using? The last shipment of babies I started with a 100 watt bulb hung down low, then moved it up. Next week I switched to 75 watts. I'm sure you get the picture.
I also had to sheets of aluminum for covers. I think they are called disposable oven liners. (I've used them in the past for transporting decorated cakes. Lots of uses for those suckers.) At any rate, I also covered or uncovered as needed. You would probably have said I was going overboard on checking the temperatures, but I lost a couple of chicks due to shipping stress and I was really worried about them.
I kept two thermometers in the brooder. One was located under the light, the other near the food. Sleeping on top of the thermometer was the "goody spot". Everybody wanted to sleep on it, lol. Right under the light I got my target temperature. The other end I couldn't get above 85 degrees, but they didn't seem to mind. They didn't shiver or anything while they were eating and drinking. When they got done pigging out, they would flop under the light. Up until this past week, my house air conditioner was doing a good job of keeping the house at 78 degrees.
