Performed AC maintenance on a Lennox XC25. Systems cooling temperature split is 21 degrees. Indoor blower is amping ok. Condensate lines are clear and functioning well. Outdoor coils were heavily dirty but cleaned up great with a chemical wash. Compressor and fan amps are in range at this time. Refrigerant levels are ok. Customer had surge protection installed today for the furnace and condenser. System was cycled before leaving.