We're the Geothermal Source in Delaware! Delaware homeowners in the know look to Geo Source One Inc. for all their geothermal heating and cooling needs. They place their confidence in us to give not only the proper installation and service but also the experience 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 whirl. Just enter your data and stand in awe of the results. Then, contact us, the Delaware, Ohio, geothermal professionals at Geo Source One Inc..