Geothermal Benefits Okay. So maybe we are a little biased. But we at O'Brien Service Company are hard-pressed to think of anyone in Wilmington who couldn't benefit from a WaterFurnace geothermal heating and cooling system. WaterFurnace geothermal systems are among the most efficient, energy-saving, and eco-friendly heat pumps Wilmington homeowners - or anyone - can buy. With a WaterFurnace geothermal system from O'Brien Service Company, you'll see... Lower operating costs. A WaterFurnace geothermal heat pump operates much more proficiently than traditional heating and cooling systems. More comfort. Our geothermal systems distribute air with incredible accuracy, eliminating hot and cold spots all year long. Quiet operation. Think of it: there's no rackety outdoor unit! Proven performance. Given their indoor installation, our geothermal systems aren't susceptible to the rain, snow, ice, debris, temperature extremes, and vandalism that knock out ordinary heat pumps and air conditioners. Environmental stewardship. Given that our geothermal systems are eco-friendly environmentally conscious heat pumps, emitting no carbon dioxide, carbon monoxide, or other greenhouse gasses. No wonder more and more people in Wilmington are turning to O'Brien Service Company for their WaterFurnace geothermal needs.