Furnace tune up and preventative maintenance on American Standard high efficiency variable speed 2-stage unit. Replaced aprilaire humidifier pad and check aprilaire Merv 13 filter. HVAC service, repair, install, indoor air quality solutions and more in Palatine, Wheeling, Rolling Meadows, Northbrook, Glenview, Mt.Prospect, Hinsdale, Schaumburg, Arlington Heights, Elk Grove Village, Des Plaines, Arlington Heights, Itasca Wood Dale, Hoffman Estates, Prospect Heights, etc.