Performed preventative maintenance on 2 Lennox AC systems. Customer changed filters recently. I did a thorough inspection of the blower assemblies, electrical components, evaporator coils, drains, and overall condition and operation of equipment. Washed condenser coils thoroughly. Checked and tested thermostat operation, wiring, capacitor, contactor, compressor, fan motor, amps, temperatures and pressures of condensers. Both systems are cooling properly within manufactured specifications at this time.