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I was waiting for someone brave enough to stick their neck out on this one before I put in my $.02 worth. I think you are right. The foil would reflect infra-red, which would warm the eggs, and not the air, making it hard to regulate the temp. The thermometer in my brooder says it's only 80 degress, but I know it's closer to 95, because the thermometer reflects the I R from the heat bulbs and does not read true.