Complete 2 system furnace repair and preventative maintenance check. Find both systems 20-year-old, system operating but operating with worn ignition, weak flame sensor. System operating with dirty duct and molded at air distribution for the master bedroom system. Blower assembly dirty. Due to system age and worn conditions, suggest air purifier system to kill molds, improve air quality and prevent molding. Suggest upgrading 20-year-old systems.