Gregory Looks to Us for Its Geothermal Needs We’re Haley Mechanical, the distinguished "go-to" team for Gregory, Michigan's geothermal heating and cooling. Gregory residents look to us for ... quality WaterFurnace geothermal heating and cooling systems highend 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 ones to do it in Gregory, Michigan. Contact Haley Mechanical today. Want to taste and see just how much "going geothermal" could save you on your energy bills? Spend a moment or two with our easy Geothermal Savings Calculator.