Homeowner stated that there is a weird smell, specially on one room ( son’s room), there are 2 gas units at this address, both units are from 2006 ,,according to customer they have never been serviced, both units have extremely dirty return plenum/ ductwork, we also noticed blower motors are very dusty and some buildup on blower wheels/ supply vents and return vents are very dirty as well ,,we highly recommended a duct cleaning, blower cleaning,,,we also recommended a thorough inspection on both units ( maintenance),to verify/ inspect all components/ safety switches ( cooling/ heating) are working properly.