Sunbury Looks to Us for Its Geothermal Needs We’re Hottinger Geothermal, the recognized "go-to" team for Sunbury, Ohio's geothermal heating and cooling. Sunbury residents look to us for ... the best WaterFurnace geothermal heating and cooling systems the best installation and service from highly skilled, highly trained professionals professional advice on how to get more out of their geothermal installations With a down economy, there's never been a opportune time to put a WaterFurnace geothermal system to use for you. And we're the professionals to do it in Sunbury, Ohio. Contact Hottinger Geothermal today. Want to taste and see just how much "going geothermal" could save you on your energy bills? Spend a moment or two with our simple Geothermal Savings Calculator.