Grand Oaks Heating & AC, is a Missouri Heating, Cooling, Plumbing, Air Conditioning, Geothermal Heat Pump, Ductless Mini-Split, and furnace repair, service, replacement and maintenance Company located in St. Charles and Warren Counties. Our company specializes in designing, engineering, and installing complete comfort systems for owners of existing homes and buildings just like yours. We take special pride in the craftsmen we train and employ--a fact you'll notice immediately in the attitude and integrity they bring to your job site. Our entire company works hard to make your experience with us hassle-free and enjoyable. Should we make a mistake, we will do everything in our power to correct it to your satisfaction.