Technician arrived for a yearly friends and family club furnace maintenance on two 2015 Lennox furnaces. Technician adjusted gas pressure, checked amps, static pressure, temperature differential and insured proper operation. Technician noticed dust and debris in the ductwork and built options for the customer on duct, cleaning and sanitation. Recommendations have been emailed to the customer for further review. Technician found no mechanical issues and both systems are heating properly at this time.