Geo Source One Inc. offers only WaterFurnace brand geothermal products to the Columbus, Ohio, OH area. WaterFurnace has been the most recognized and respected name in the industry for nearly three decades. Every unit is tested before it leaves the manufacturing facility to ensure flawless operation on startup. We combine a commitment to quality installations with WaterFurnace's commitment to quality products - that's the best of both worlds. Smaller, lighter and more efficient than ever. When paired with one of our split systems, a 5 Series SAH Air Handler provides the perfect solution for replacing an air conditioner or heat pump in homes with limited utility space.