Furnace and tune up on Rheem 96% efficient 2 stage variable speed unit. Replaced Merv 11 High efficiency aprilair filter and aprilair 700 humidifier pad. HVAC service and repair in Palatine, Wheeling, Rolling Meadows, Northbrook, Glenview, Highland Park, Hinsdale, Schaumburg, Arlington Heights, Elk Grove Village, Des Plaines, Wood Dale, Itasca, Mt.Prospect, Prospect Heights, Long Grove, Buffalo Grove, Elgin Hoffman Estates, and more.