Arrived at the home and the homeowner indicated where the units are located. Proceeded to do maintenance. Checked voltages and amps. Cleaned/flushed drain line. Checked refrigerant charge, sight glass was flashing, found it low 1 lb of R410a. Added: jug 320. Additionally, mentioned to the homeowner that there is growth in the air handler cabinet, installed UV light is no longer operational, an Evaporator clean in place, and that the equipment is 8 years old. They are going to remodel home, so will wait on further estimates.