Performed AC maintenance on a Lennox package unit. Heating mode temperature split is 53 degrees. Flame sensor was cleaned. Inducer motor is in range. Blower is amping in range. Filter was dirty and replaced today. Cooling temperature split is 20 degrees. Coils were extremely dirty and chemically cleaned off today to factory standards. Refrigerant pressures verified okay. Starting components were checked and verified to still be in range. Condensate lines are clear.