Maintenance at Springbrook Health & Rehab Centre, Hazen, Arkansas

How serious is the heat in the attic on insulated duct work that runs thru the attic for a distance of about 80 feet. the temperature in the attic varies based on the time of day. Example from 8:00 am til about 6:;00 pm the temperature will be approximately 125 degrees. Should I double or triple insulate the A/C ductwork, or just install attic fans to remove the excessive hot air?