We're Sinking Spring's Primary Geothermal Contractor! Sinking Spring, Pennsylvania, homeowners have all sorts of reasons for desiring a geothermal heating and cooling system: phenomenal year-round comfort – no matter how extreme the seasonal variations stable operating performance energy efficiency (They’d be hard-pressed to find a more "green," more natural way to heat and cool their homes!) significant – often extraordinary – savings on their energy bills premium installation and service from Paul W. Essig Inc., Sinking Spring's geothermal experts. Learn more about what a geothermal heating and cooling system can do to benefit your family's comfort. Look at our Geothermal Savings Calculator. Then contact Paul W. Essig Inc.. We sell, install, and maintain heating & cooling geothermal systems, the very best in the industry today.