Complete 2 heating maintenance in Norcross. Find 2 10 year old Goodman gas furnace operating. Change both media filter customer provided. Check safety and operations. Find upstairs gas furnace operating with in manufacturer spec. Find inducer assembly motor starting to ware and motor making minor noise. Need to keep check. Reduce heating fan speed to help reduce noise for bedroom. Find downstairs furnace operating with in manufacturer spec. No concern at this time. Suggest in-line water protection for both system, suggest surge protection and air purifier system.