I add babies every couple years, have been for 20years. I have NEVER let my chick brooder get hotter than about 85* and that's just day 1 through 5. After than it's around 75-80. It just seems way to hot to start at 100. Yet everything you read as a newbie says start at 100*.... I just don't. And they're great. I have a mommy hut to go under if they get cold but that's certainly not 100* either. Just curious how many people don't agree with excessive heat....