Furnace tune up, performed annual maintenance on Lennox furnace located in Winnetka Illinois. Yearly furnace inspections can help prevent untimely breakdowns and keep in line with manufacturer warranty. North Shore Heating and Cooling a qualified HVAC contractor, located in Glenview illinois near you, are experts in HVAC service, HVAC repair and HVAC installation. Call us today at 847-729-1040 or visit us at www.northshoreheatingandcooling.com