We're the Geothermal Source in Wilmington! Wilmington residents in the know look to J. Zanes LLC for all their geothermal heating and cooling needs. They place their confidence in us to provide not only the proper installation and service but also the insight to help them maximize the potential from their geothermal systems. Considering a geothermal system of your own? Give our nifty little Geothermal Savings Calculator a try. Just load it with your data and marvel at the results. Then, contact us, the Wilmington, Delaware, geothermal professionals at J. Zanes LLC.