Replaced broken heat strip and tested. Ultimate Cooling Tune-Up: cleaned coils, brushed and cleaned traps, added pan treatment tablets to pan. tested and checked all controls, wiring connections. tested temperatures, checked filters. checked refrigerant temperature and pressures, tested static duct pressure. tested blower operation, tested cooling operation to ensure working within manufacturer specifications. 1st floor system has media filter on furnace. You should not have filters in the walls. This double filtering and causes higher static pressure and bad airflow. Also this type of filter is a once a year filter. It’s in good shape. 2nd floor filters 14x14x1 and 18x18x1. You had 18x18 in mechanical closet. We will need to replace the 14x14x1. That filter didn’t look to bad.