We're the Geothermal Source in Douglassville! Douglassville people in the know look to Paul W. Essig Inc. for all their geothermal heating and cooling needs. They count on us to provide not only the proper installation and service but also the insight to help them get the most from their geothermal systems. Considering 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 Douglassville, Pennsylvania, geothermal professionals at Paul W. Essig Inc..