We're the Geothermal Source in Key Peninsula! Key Peninsula residents in the know look to Thermal Systems for all their geothermal heating and cooling needs. They count on us to give not only the proper installation and service but also the knowledge to help them maximize the potential from their geothermal systems. Thinking about a geothermal system of your own? Give our nifty little Geothermal Savings Calculator a try. Just fill-in your data and marvel at the results. Then, contact us, the Key Peninsula, Washington, geothermal experts at Thermal Systems.