Sign up 2 comfort control maintenance plan and complete 2 heating maintenance in Alpharetta. Find 2 Amana gas furnace in attic. Change upstairs filter, check safety and operations. Find 2 7 year old furnace operating with weak flame sensor and under-fire furnace. Find duct works undersize and not R-8 rated. Complete repair on furnace, replace flame sensor and combustion calibration service. Suggest surge protection, suggest in-line water protection and air purifier.