Performed preventative maintenance for high efficiency furnace. Inspected all the electrical components. Confirmed proper high and low voltages. Tested the amp draw for the blower and inducer. Both were operating within the manufacturer specs. Cleaned the burners, flame sensor and burner compartment. Checked for any condensation leaks within the furnace. Tightened any screws that seem to be loose. Performed a combustion analysis on the system. System is operating at 92% efficiency with a CO level of 21ppm. Performed a humidifier service on a bypass humidifier. Cleaned the housing out and replaced the #35 water panel. This system also has a Lennox pure air system (X8796). Due to this being a new customer I didn’t have the kit with me. Will need to return to replace kit. Installed a temporary filter since the current one was 16 months old and 4 months over due. Wasn’t comfortable leaving old filter. Customer prepaid for the pure air kit replacement. The office will call to schedule a ret