Geothermal Heating & Cooling: Plymouth's Choice! To be perfectly accurate, let's put it this way: more and more Plymouth residents are discovering that geothermal is the most effective heating and cooling choice. And we're helping them see that. We're Professional Geothermal Systems. And we understand all about the perks 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, Plymouth is located in a region with perfect soil conditions for geothermal installation. We've also got the kind of fluctuating temperature extremes that let a geothermal system demonstrate its year-round comfort capabilities 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 Professional Geothermal Systems, your Plymouth, Wisconsin geothermal authority.