Performed AC and Fuenace maintenance on a Lennox system. Burner operation was checked. Flame sensors and limit switches were cleaned and verified in correct working condition. Filter is ok. Heating temperature split is in range at 33. Blower compartment is clean and spinning freely. Outdoor unit was chemically cleaned. Compressor bay and service panel was cleaned. Refrigerant levels were verified in range and recorded. Starting components were measured. Compressor and fan amp draws are good. System was running st end of appointment. Customer had questions about thermostat. A full tutorial was given for the sensi thermostat and customer is happy at end of appointment.