Geothermal Heating & Cooling: Grinnell's Choice! To be completely honest, let's put it this way: more and more Grinnell residents are finding out that geothermal is the smarter heating and cooling choice. And we're helping them see that. We're Latcham Enterprises. And we know all about the advantages of geothermal heating and cooling. After all, we've been installing and maintaining geothermal systems for a long time. What makes geothermal a no-brainer here? For starters, Grinnell is located in a region with ideal ground conditions for geothermal installation. We've also got the kind of changing temperature extremes that let a geothermal system demonstrate its year-round comfort potentiality to best effect. Consider the savings, too. Our Geothermal Savings Calculator can give you a good idea of what they'd be for your family. Learn more. Contact Latcham Enterprises, your Grinnell, Iowa geothermal authority.