We're Granville's Primary Geothermal Contractor! Granville, Ohio, residents have all kinds of reasons for wanting a geothermal heating and cooling system: remarkable comfort all year – no matter how extreme the weather variations stable operating performance energy performance (They would look forever to find a more "green," more natural way to heat and cool their homes!) significant – sometimes amazing – savings on their energy bills premium installation and service from Hottinger Geothermal, Granville's geothermal experts. Learn more about what a geothermal heating and cooling system can do to benefit your family's comfort. Check out our Geothermal Savings Calculator. Then contact Hottinger Geothermal. We sell, install, and maintain WaterFurnace geothermal systems, the very best on the market today.