Geothermal Heating & Cooling: St. Mary's City's Choice! To be perfectly honest, let's put it this way: more and more St. Mary's City residents are coming to the same conclusion that geothermal is the smarter heating and cooling choice. And we're helping them recognize that. We're Continental Services. And we understand all about the perks of geothermal heating and cooling. After all, we've been installing and maintaining geothermal systems for a long time. Why are more people switching to geothermal? For starters, St. Mary's City is situated in an area with perfect ground conditions for geothermal installation. We've also got the kind of changing temperature extremes that let a geothermal system display its year-round comfort capabilities to best effect. Consider the savings, as well. Our Geothermal Savings Calculator can give you a good idea of what they'd be for your family. Learn more. Contact Continental Services, your St. Mary's City, Maryland geothermal authority.