Avoca Looks to Us for Its Geothermal Needs We’re Camblin Mechanical Inc., the distinguished "go-to" team for Avoca, Iowa's geothermal heating and cooling. Avoca homeowners are turning to us for ... quality WaterFurnace geothermal heating and cooling systems highend installation and service from highly skilled, highly trained professionals sound advice on how to get more out of their geothermal installations With the economy like it is, there's never been a opportune time to put a WaterFurnace geothermal system to work for you. And we're the ones to do it in Avoca, Iowa. Contact Camblin Mechanical Inc. today. Want to see just how big "going geothermal" could save you on your energy bills? Spend a moment or two with our simple Geothermal Savings Calculator.