I put about 15 4 week old chicks out in my outdoor hoop coop with the heat plate. They never bothered with it. I put them under it the first night, and they crawled out and huddled in a group next to it to sleep. Temps got below freezing and never lost a chick. I pulled the plate out within a few days.
Ok, that is great news. And you live in Indiana so same climate. I only have 10, but from your review am sure they will be ok