Geothermal Heating & Cooling: Saint Marys's Choice! To be perfectly accurate, let's put it this way: more and more Saint Marys residents are coming to the same conclusion that geothermal is the smarter heating and cooling choice. And we're helping them see that. We're Ground Source, Inc.. And we understand all about the advantages of geothermal heating and cooling. After all, we've been installing and servicing geothermal systems for a long time. Why are more people switching to geothermal? To start with, Saint Marys is situated in an area with perfect soil conditions for geothermal installation. We've also got the kind of fluctuating temperature highs and lows that let a geothermal system display its year-round comfort potentiality to best effect. Consider the savings, too. Our Geothermal Savings Calculator can give you a ball park figure of what they'd be for your family. Learn more. Contact Ground Source, Inc., your Saint Marys, Kansas geothermal authority.