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 performance (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 service from O'Brien Service Company, Hampstead's geothermal professionals. Find out 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 on the market today.