I have 7 three-day-old chicks, and they were avoiding the area under the heat lamp when it was radiating heat around 94. I raised the lamp and watched for their comfort level, and the like it around 90-88. The brooder is inside my house, in a spare room with the a/c vent closed, but the outdoor temps here in NW GA have been in the upper '80's during the day. I got up to check on my chicks 3 times last night, cause I was worried that the temperature might drop too much, but they were always comfortable. And I'm feeling better now that I switched to a digital thermometer. The first two indoor/outdoor thermometers that I bought were real pieces of junk, a complete waste of money. And since my chicks are so "cool," I'm naming one Fonzie and the rest from other characters from Happy Days. Fonzie will be whichever chick shows herself as first in the peaking order. The others will be Chachi, Potzi, Ralph, Big Al (reserved for the largest), Richie and Joni.