Harlan, Iowa, Geothermal More and more people in Harlan, Iowa, are looking into the benefits of geothermal heating and cooling. Their prime resource? That's us: Sherman Co. LLC. Our expertise is the service and installation of industry-leading WaterFurnace geothermal systems. So the intricate workings of geothermal heating and cooling are no mystery to us. Harlan residents understand we’re glad to share what we know about the subject, too. For instance: Geothermal heating and cooling systems give exceptional comfort throughout the year, despite fluctuating temperature highs and lows. Geothermal energy is a resource that is renewable – about as “green” as you can get! The smooth operation and energy efficiency of a geothermal heating and cooling system can save Harlan residents big money on their energy bills. (Use our Geothermal Savings Calculator to see just how much you could save.) There's so much more we can tell you about geothermal benefits. And when you're ready to try them yourself, we’ll offer the installation and service required to get the most out of your own WaterFurnace geothermal heating and cooling system. Contact Sherman Co. LLC today.