Hefel Geothermal

We are Hefel Geothermal, based in Hazel Green, Wisconsin. Our work is led by Terry Hefel, who has been installing heating and cooling systems since 1984 and was the first licensed geothermal contractor in the Tri-State Area. His decades of hands-on experience provide the foundation for the knowledgeable, personalized service we offer homeowners.

We install systems ranging from basic forced-air heating and cooling equipment to sophisticated triple-function units. With that breadth of experience, we can evaluate the available options and recommend the system that best fits each homeowner’s needs.

Terry has installed hundreds of units while working directly with homeowners. That direct involvement is central to how we work and allows us to provide a personalized experience. We are committed to professional, reliable workmanship and to giving every homeowner the benefit of Terry’s extensive heating and cooling experience. To discuss your heating and cooling needs with us, call Hefel Geothermal at (608) 568-3506.