Seabrook Island Looks to Us for Its Geothermal Needs We’re AGL Services Heating & Air Conditioning, the recognized "go-to" team for Seabrook Island, South Carolina's geothermal heating and cooling. Seabrook Island homeowners look to us for ... quality WaterFurnace geothermal heating and cooling systems the best installation and service from highly skilled, highly trained professionals sound advice on how to maximize the potential of their geothermal installations With the economy like it is, there's never been a opportune time to put a WaterFurnace geothermal system to use for you. And we're the ones to do it in Seabrook Island, South Carolina. Contact AGL Services Heating & Air Conditioning today. Want to taste and see just how much "going geothermal" could save you on your energy bills? Take a moment or two with our easy Geothermal Savings Calculator.