Thornville, Ohio, Geothermal Hottinger Geothermal is the best WaterFurnace geothermal contractor in Thornville, Ohio. We'll help you understand all the benefits of geothermal heating and cooling. We’ll see to it that your WaterFurnace system is correctly installed, too. And when it comes time for service? Nobody in Thornville can beat our service! Contact Hottinger Geothermal today. Like a little sneak-peek at the savings a WaterFurnace geothermal heating and cooling system can give you? Use our easy Geothermal Savings Calculator.