Manufacturer Lennox Model # XC14S036-230A09 Serial # 5816K01305 Completed a preventative maintenance on a 7 year old Lennox unit. The split temperature is 20 degrees. Customer changed 16x20x4 filter. Then I made sure the drain was operating properly. After that I performed a amperage readings on the condenser fan motor and compressor 5.4 amps. The contactor and capacitor are both working properly. The condenser coil was very dirty the condenser fan motor amps where .89 after the condenser coil cleaning it went down to .76 amps!! System is operating properly at this time