Grand Oaks Heating & AC, is a Missouri Heating, Cooling, Air Conditioning, Geothermal Heat Pump, Ductless Mini-Split, duct cleaning, and furnace repair, service, replacement and maintenance Company located in St. Charles and Warren Counties. Grand Oaks Heating & AC employs only the best technicians for air conditioner repairs and, furnace repairs as well as all air conditioner replacements, furnace replacements and boiler replacements St Charles Mo, St Peters, Wentzville Mo, St Louis, St Charles city. We work in St. Louis, Lincoln , Warren and Pike Counties in Missouri. In Illinois we service E. St Louis,Alton, Fairview heights, Granite City. To set-up a repair service estimate or replacement estimate, call (636) 926-2007. Grand Oaks Heating & AC is an authorized factory dealer of many brands and services all furnace, AC, humidifier, filter, thermostat and water heater brands including Carrier, Bryant, Payne, Trane, Lennox, Rheem, Ruud, Amana, Crown, Frigidaire, Gibson, Goodman, Lochinvar, Maytag, Weil McLain, AO Smith, Kohler, American Standard, GeoExcel, General, Aprilaire, Honeywell, White Rodgers, Dynamic, Daikin, Mitsubishi, Fujitsu, True refrigeration parts, and Skuttle.