Tech arrived at a tune-up. Upon inspection, the duel run capacitor was within specs. The contactor was in working condition. The condenser coils were hosed off to assist with air flow across the coils. The filter was dirty. The drain had no safety. The flame sensor was scorched. The ductwork and blower area was dirty. The customer was informed of recommendations today. She decided to move forward with upgrading the filter, adding a drain switch and replace the blower capacitor. These items were installed, tested and functional. The customer supplied thermostat was installed. The system was functioning upon departure.