Manufacturer Lennox Model # 14ACX-030-230-11 Serial # 1911H22000 Completed a preventative maintenance on a Lennox unit. The temperature split on the unit was 23. Customer changed the 16x20x1. Did a amperage readings on the condenser fan motor and compressor both are operating properly. Condensate pump is working properly at this point. Made sure all electrical connections are tight and secure. System is operating properly at this point