Annual maintenance on three high efficiency two stage 2018 Trane furnaces. The systems are in great shape and running as they should. One system was missing a safety switch on the evaporator coil so that was added today for protection of the home and equipment from any water damage. The customer also complained of a musty smell in the master bedroom so a air scrubber was added to the system to tackle that Oder and kill any type of mold or bacteria that could be in the supply plenum or evaporator coil. All three systems are ready for the winter months ahead.