Service call in Norcross. Complete tune up inspection special. Replace dirty filter, check safety and operations. Find poor duct system in attic and only R6 rated and need to be R-8 to meet code. Find daughter bedroom 6†duct run in correctly and reducing air flow. Adjust for customer to increase air flow. Find 10 year old Trane gas furnace operating with weak flame sensor and combustion calibration off. Suggest repair and give customer estimate to for duct system.