Geothermal Heating & Cooling: Delaware County's Choice! To be perfectly accurate, let's put it this way: more and more Delaware County residents are finding out that geothermal is the most effective heating and cooling choice. And we're helping them recognize that. We're Hottinger Geothermal. And we know all about the benefits of geothermal heating and cooling. After all, we've been putting in and maintaining geothermal systems for a long time. Why are more people switching to geothermal? For starters, Delaware County is situated in a region with ideal soil conditions for geothermal installation. We've also got the kind of seasonal temperature extremes that let a geothermal system show off its year-round comfort capabilities to best effect. Consider the savings, as well. Our Geothermal Savings Calculator can provide you with a good idea of what they'd be for your family. Learn more. Contact Hottinger Geothermal, your Delaware County, Ohio geothermal authority.