Geothermal Heating & Cooling: Sunbury's Choice! To be perfectly honest, let's put it this way: more and more Sunbury residents are finding out that geothermal is the most effective heating and cooling choice. And we're helping them see that. We're Hepler Geothermal Inc.. And we know all about the benefits of geothermal heating and cooling. After all, we've been installing and maintaining geothermal systems for years. Why are more people switching to geothermal? For starters, Sunbury is situated in an area with perfect soil conditions for geothermal installation. We've also got the kind of seasonal temperature extremes that let a geothermal system demonstrate its year-round comfort capabilities to best effect. Think about the savings, as well. Our Geothermal Savings Calculator can provide you with a ball park figure of what they'd be for your family. Learn more. Contact Hepler Geothermal Inc., your Sunbury, Pennyslvania geothermal authority.