Complete 1 system furnace repair and preventative maintenance check. The customer will renew in spring visit for the cooling check. Change filter, check operations and safety. Find Trane furnace drain port was clogged for 90% furnace, clear port. Find pressure switch have minor wear and need to keep a check. System dirty and early growth of molds, suggest air purifier system to improve air quality and prevent molding. System operating at this time.