Complete 2 heating maintenance for both gas furnace in braselton. Find upstairs 15 year old carrier gas furnace operating with in manufacturer spec. No concern at this time. Suggest in-line water protection and suggest air purifier system to help improve air quality and prevent molding. Find main level Amana gas furnace 3 year old operating with in manufacturer spec. Change main filter 16x25x5 filter customer provided. Suggest air purifier system. Both gas furnace operating at this time.