Hefel Geothermal

Hefel Geothermal serves Hazel Green, Wisconsin and the surrounding Tri-State Area with a perfect 5.0-star rating across four verified customer reviews. Terry Hefel founded the business and has been installing heating and cooling systems since 1984, earning recognition as the first licensed geothermal contractor in the Tri-State Area. The company handles everything from standard forced air systems to advanced triple-function geothermal units, providing personalized recommendations tailored to each homeowner's specific needs.

What distinguishes Hefel Geothermal is their deep specialization in geothermal technology, which the company has focused on for decades. Unlike generalist HVAC contractors, they concentrate exclusively on geothermal heating and cooling, giving them expertise that generalists cannot match. Their approach emphasizes direct homeowner communication and customized system design rather than one-size-fits-all installations, with a stated commitment to professional and reliable workmanship on every project.

Customer reviews highlight specific scenarios demonstrating their expertise: Tom Cosley's review describes a comprehensive geothermal furnace and in-floor heating installation where Terry provided a clear bid and personally educated him on system maintenance. Kevin Gallagher noted Terry delivered a replacement geothermal system on short notice and corrected problems that a previous contractor had introduced. Bill Ploessl praised same-day service when his geothermal system required attention, with Terry arriving to diagnose and resolve the issue immediately.