Technician arrived to perform a yearly friends and family club furnace maintenance on two furnaces. Technician adjusted gas pressure, checked amps, checked static pressure, checked temperature differential, cleaned flame sensors, checked filters and insured proper operation. Technician noticed dirty ductwork while changing filters and made estimates for the customer on getting them cleaned and sanitized. There were also issues with the unit in the shed, but the customer never uses the system and didn’t want to move forward on any repairs with it. Estimates have been emailed to the customer for further review. Both systems were heating properly.