AC maintenance. Cleaned and serviced condensing units. Tested capacitors,contactors,fan motor amperage and compressor motor amperages. Check all 410 refrigerant levels. In unit #3 in alley, replaced a run capacitor due to being low and not turning on unit. Unit #2 was low on refrigerant, added 1-1/2lbs of 410 to achieve adequate efficiency. Replaced all furnace filters. Order a box of 20x25x1 filters from Rogers for this job. All units are cooling as they should at this time.