Performed heating maintenance on a 2020 Lennox 96% efficient single stage natural gas furnace 16x25x1 filter is in good shape, looks almost brand new (using the correct MERV8 rating filter, please continue to use these same filters) Blower wheel is a touch dirty, at this point it doesn't seem to be causing system performance issues. Pulled and cleaned the flame sensor Condensate trap is clear Checked internal condensate lines for blockage Intake air screen free or debris Intake and exhaust pipes showing no signs of leakage at fitting glue joints Burners in good shape Run tested furnace Gas pressure set to 3.5"wc with reference to the sealed burner box Increased blower speed Temperature rise is a steady 62⁰ (spec is 35-65⁰) No signs of water leaks internal or external to the furnace 0ppm carbon monoxide present No concerns found on today's visit Furnace operating within factory specifications at this time