Geothermal Heating & Cooling: Gig Harbor's Choice! To be completely honest, let's put it this way: more and more Gig Harbor residents are coming to the same conclusion that geothermal is the most effective heating and cooling choice. And we're helping them recognize that. We're Thermal Systems. And we understand all about the perks of geothermal heating and cooling. After all, we've been installing and maintaining geothermal systems for years. What makes geothermal a no-brainer here? For starters, Gig Harbor is situated in an area with perfect ground conditions for geothermal installation. We've also got the kind of changing temperature highs and lows that let a geothermal system show off its year-round comfort capabilities to best effect. Think about 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 Thermal Systems, your Gig Harbor, Washington geothermal authority.