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The contractor demonstrated strong technical expertise in geothermal system design, installation, and troubleshooting, with technicians providing clear explanations of system operation and maintenance to homeowners. Response time was notably quick, with same-day service calls and prompt follow-up support, while the team corrected previous installation issues and delivered reliable system performance.
Based on Google reviews
About the Contractor
Hefel Geothermal is a specialized ground-source geothermal contractor based in Hazel Green, Wisconsin, in the southwestern corner of the state near the Iowa and Illinois borders. Owner Terry Hefel has been installing heating and cooling systems since 1984 and is described as the first licensed geothermal contractor in the Tri-State Area covering Wisconsin, Iowa, and Illinois. The company installs ClimateMaster geothermal equipment ranging from standard forced-air systems to triple-function units for combined heating, cooling, and domestic hot water. With decades of hands-on experience and hundreds of installations, Hefel Geothermal provides direct owner engagement and personalized project consulting for residential clients throughout Grant County and neighboring regions.
The first licensed geothermal contractor in the tri-state area with over 40 years of experience and 400+ installations, including the region's first horizontal slinky loop configuration.
Service Details
schedule
Years in Business
42 years
precision_manufacturing
Boring Methods
Horizontal
factory
Brands Installed
ClimateMaster
Regulatory Context
Geothermal Permitting in Wisconsin
Geothermal heat pump installations in Wisconsin require specific permits and compliance with state regulations regarding well drilling, loop installation, and refrigerant handling. Contact your local building department for specific requirements in your area.
Hefel Geothermal installs both ClimateMaster and GeoStar geothermal heat pump units and can help you decide which unit is right for your home.
Yes, in addition to forced air systems, Hefel Geothermal designs and installs radiant floor heating systems that cycle warm water beneath your flooring. This makes for a more quiet, more comfortable, and less drafty system while keeping your toes warm.
Hefel Geothermal offers a comprehensive ten-year parts and labor warranty on all installations.
Yes, Hefel Geothermal offers service on most other brands of geothermal heat pumps, not just the units they install.
Geothermal systems installed by Hefel Geothermal can reduce your overall energy expenses by up to 70% and hot water expenses by up to 50% compared to conventional systems.
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Thanks — we'll review your request and forward it to Hefel Geothermal within 1 business day. If you asked to compare quotes, we'll pass it to up to two more local installers as well. They typically respond within 1–2 business days after that.
If you need to reach Hefel Geothermal directly: (608) 568-3506
Geothermal heat pump installations in Wisconsin may require drilling permits, environmental site assessments, and compliance with local well and thermal energy regulations. Requirements vary by jurisdiction and system type (vertical, horizontal, open-loop). Contact your local municipality, state energy office, or a licensed geothermal installer for specific permitting requirements in your area.
