We're Hampstead's Primary Geothermal Contractor! Hampstead, North Carolina, residents have all kinds of reasons for wanting a geothermal heating and cooling system: exceptional year-round comfort – no matter how extreme the weather 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 – sometimes amazing – savings on their energy bills noteworthy installation and maintenance from O'Brien Service Company, Hampstead's geothermal professionals. 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 O'Brien Service Company. We sell, install, and service WaterFurnace geothermal systems, the finest available today.