Performed maintenance on a Lennox XC25. Systems cooling split is 20 degrees. Compressor and fan amps are in range. Outdoor coils were dirty, they were chemically cleaned today. Condensate lines are clear and free from debris. System is equipped with a merv rack. Filter was very dirty and also changed out with a new filter today as well. Duct runs are free from obstruction and sealed. System is not protected. System was cycled before departure