Geothermal Heating & Cooling: Greenfield's Choice! To be perfectly honest, let's put it this way: more and more Greenfield residents are discovering that geothermal is the smarter heating and cooling choice. And we're helping them see that. We're Camblin Mechanical Inc.. And we know all about the benefits of geothermal heating and cooling. After all, we've been putting in and servicing geothermal systems for years. What makes geothermal a no-brainer here? To start with, Greenfield is situated in a region with perfect ground conditions for geothermal installation. We've also got the kind of fluctuating temperature extremes that let a geothermal system demonstrate its year-round comfort potentiality to best effect. Think about the savings, as well. Our Geothermal Savings Calculator can provide you with a ball park figure of what they'd be for your family. Learn more. Contact Camblin Mechanical Inc., your Greenfield, Iowa geothermal authority.