I have a metal roof over my two level patio. During the heat of the day the section closer to the roof is obviously a lot warmer. Unfortunately that's where the seating is. Would adding insulation to the bottom of the metal panels help?
In my shop I have a couple places where there is just a sheet of osb hung up between me and the underside of the metal roof. It’s noticeably cooler under the osb. Insulate it with whatever is the easiest to use and put a ceiling in if you want it to look pretty. It will be a big difference.