Customer has 10 y/o Lennox furnace matched with 17 y/o Payne AC that operates for main level and 38 y/o Carrier furnace matched with 14 y/o Lennox AC that operates for upper level. Systems are well past life expectancy. Experiencing significant decline and component failures. Performed blower wheel cleaning for both systems. Upgraded water protection for main level system. Replaced 40/5 MFD capacitor and 1-pole contactor for upper level system. Replaced four 20x25x1 filters. Informed customer of findings. Based on our findings today, it might be time to think about getting a brand new system.