Technician arrived to perform a yearly friends and family club furnace maintenance on at 2019 Lennox furnace. Technician adjusted gas pressure, checked amps, checked static pressure, checked temperature differential, cleaned flame sensor, checked filters and insured proper operation. Technician noticed dirty ductwork while changing filters and no surge protection on the unit, so estimates were made for the customer on getting the ductwork cleaned and sanitized and also getting the unit protected. Estimates were emailed to the customer for further review. The system is heating properly at this time.