Geothermal is Big in New Castle County! New Castle County, Delaware, homeowners enjoy geothermal heating and cooling. And why shouldn't they? We've got the perfect ground conditions here. And our seasonal temperature extremes make geothermal installations an excellent choice for year-round heating and cooling comfort. Want to look at how much a geothermal system of your own could lower your monthly costs in New Castle County? Check out our handy Geothermal Savings Calculator. Then do what so many other New Castle County homeowners have done. Contact the experts at Ground Loop Heating & Air Conditioning, Inc. We'll help you plan your geothermal system, install it right, and make sure you get the service you need to get the most out of it.