Upon arrival to system I was shown to an HVAC system that was having trouble reaching the thermostat desired temperature. Put gauges on the system to verify the systems refrigerant levels which are fully within range of specifications at this time. Went up into the attic to the A/H for further inspection and found the systems return plenum to be falling off the unit. The unit is currently pulling in attic air from the bottom. The unit has also pulled in a significant amount of debris into the evaporator coil, I suggest a pull and clean on this system’s evaporator coil. During the hottest point of the day the attic can reach 140 degrees. With the unit pulling in this hot of air into the system it will never reach its desired temperature. I added an estimate to the invoice to be able to repair the return plenum with the proper materials. The system is currently operating in the cooling mode and the thermostat is at 79 degrees. The homeowner will not be moving forward with work today,