Geothermal Heating & Cooling: Bellevue's Choice! To be completely honest, let's put it this way: more and more Bellevue residents are coming to the same conclusion that geothermal is the most effective heating and cooling choice. And we're helping them see that. We're Vaughn Mechanical. And we know all about the benefits of geothermal heating and cooling. After all, we've been putting in and servicing geothermal systems for a long time. Why are more people switching to geothermal? To start with, Bellevue is situated in a region with ideal soil conditions for geothermal installation. We've also got the kind of seasonal temperature highs and lows that let a geothermal system display 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 Vaughn Mechanical, your Bellevue, Washington geothermal authority.