Sounds good. You may have to go back an forth providing heat when needed until they are feathered. Do what you believe they need. It won't hurt them to be at 82, it soon will be hotter than that as you said. If it's too cool to be out I leave mine in and provide brooder entertainment by giving...
Normally you start brooding at 85-95 degrees, you decrease your heat by 5 degrees a week until they are fully feathered at 6-8 weeks, or until brooder temperatures and ambient temperatures are the same. At 12 days they should be acclimated to 80-90 depending on where you started. They will...