Johnstown Looks to Us for Its Geothermal Needs We’re E & D Company HVAC LLC, the distinguished "go-to" team for Johnstown, Pennsylvania's geothermal heating and cooling. Johnstown residents are turning to us for ... the best WaterFurnace geothermal heating and cooling systems expert installation and service from highly skilled, highly trained professionals professional advice on how to maximize the potential of their geothermal installations With the economy like it is, there's never been a better time to put a WaterFurnace geothermal system to work for you. And we're the professionals to do it in Johnstown, Pennsylvania. Contact E & D Company HVAC LLC today. Want to see just how much "going geothermal" could save you on your energy bills? Take a moment or two with our easy Geothermal Savings Calculator.