Customers, complaint of system not keeping up desired temperature. Technician inspected the whole system. Checked refrigerant charge. Diagnosed that ductwork is the main issue. System is pulling hot. Attic air from the return into the machine. Causing a high strain on the system. Supply duct is old metal style, not insulated. It is highly recommend to have a ductwork redone, and maybe even possibly more insulation up in the attic to solve this problem
