Performed Combo tuneup on a 2020 Lennox gas heater and AC. Homeowner requests the filter in the attic be removed so he can change the filter at the return grills as normal. This was accommodated for him. A gas pressure adjustment was made today. Sensors and switches were cleaned and tested. Gas valve and ignitor were measured and recorded. Duct runs are sealed. Condensate lines are clear. Outdoor unit was chemically cleaned. Outdoor components were measured and are in range. Refrigerant levels were verified to be in range. The thermostat had high and low limits that were adjusted to accommodate any comfort level that the homeowner wants. Condition of the unit was discussed with the customer. System is running at end of appointment.