Yes, you can use a heating pad used for humans, just make sure it does not have an auto shut off. Here's a link to the MHP thread
https://www.backyardchickens.com/th...d-in-the-brooder-picture-heavy-update.956958/
https://www.backyardchickens.com/th...d-in-the-brooder-picture-heavy-update.956958/