Carlton Looks to Us for Geothermal Heating & Cooling! We're Willow River Geothermal . And we're known throughout Carlton, Minnesota, for our geothermal heating and cooling expertise. Homeowners turn to us for ... superior geothermal system installation and service experienced, highly trained personnel who understand every detail of geothermal heating and cooling - and know how to help you understand advice on how to get the most from their geothermal heating and cooling installation Of course, a major reason people turn to us in the first place is for the savings they can realize on their energy bills with a geothermal system. Want a snap shot? Give our Geothermal Savings Calculator a go. Then push forward with the next step and contact Willow River Geothermal . We'll walk you through more of what makes geothermal systems the best choice for year-round heating and cooling comfort in Carlton.