Here's one. https://www.backyardchickens.com/threads/mama-heating-pad-in-the-brooder-picture-heavy-update.956958/
Here's one I wrote. https://www.backyardchickens.com/articles/reasons-for-tossing-out-your-indoor-brooder-and-start-raising-your-chicks-outdoors.71995/
If it's any consolation...