Performed home care on one system. Checked all electrical and amperage. Changed filter 16 x 25 x 5. No in-line safety. Has wet switch. Flushed and treated drain line. Evaporator coil and blower wheel are good. Clean the flame sensor. Checked outdoor unit. Checked capacitor, contactor, and pressures. All are within manufacturer specs. Checked both heating and cooling. All systems operating.