Geothermal Contractors in Wisconsin | 42 Verified Pros
Wisconsin has 42 verified geothermal contractors and an official common system-cost reference of $25,000–$30,000. Use the 2026 Wisconsin geothermal cost guide for current Focus on Energy amounts, DNR drilling rules and complete quote requirements.
42 listed contractors
37 cities covered
★ 4.9 avg rating (16,575 reviews)
19 WaterFurnace dealers
7 IGSHPA-certified
Top Wisconsin cities for geothermal contractors
Coverage spans the Milwaukee metro (Milwaukee, Waukesha, Racine, Kenosha), the Madison metro and southwest Wisconsin, the Fox Valley (Green Bay, Appleton, Oshkosh), the Chippewa Valley (Eau Claire, Chippewa Falls), and the Northwoods. Wisconsin's lake-rich freshwater geography also favors pond loops in many counties.
Janesville
3 contractors
Eau Claire
2 contractors
Greenville
2 contractors
Madison
2 contractors
Antigo
1 contractor
Appleton
1 contractor
Ashland
1 contractor
Beaver Dam
1 contractor
Black Earth
1 contractor
Burlington
1 contractor
Cashton
1 contractor
Centuria
1 contractor
Featured Wisconsin geothermal contractors
The contractors below are Wisconsin's highest-rated on Geothermal Finder, ranked by review volume then overall rating.
Focus on Energy currently lists $750 for an eligible geothermal system with auxiliary electric-resistance heat or qualifying LP without natural-gas access, and $1,000 with natural-gas auxiliary heat. Equipment, property, professional, permit and filing requirements apply. Confirm the deadline in writing because the current page includes both a 60-day/August 31 submission instruction and a later installation-eligibility statement. The federal residential credit is unavailable for systems placed in service after December 31, 2025.
Wisconsin is humid continental statewide — Dfa in the south (Milwaukee, Madison) and Dfb in the north (Wausau, Eau Claire, Superior). Long, cold winters with -20°F+ extremes in the Northwoods make ground-source's stable-loop advantage dramatic. Heating load dominates; cooling load is moderate. Ground temperatures at typical loop depth stay around 48–52°F.
Wisconsin sits on extensive glacial drift across the southern two-thirds — sandy loam, silt loam, and till — making drilling predictable. The Driftless Area in southwest Wisconsin has thinner soil over Cambrian sandstone with karst features in some counties; experienced drillers grout carefully. Northern Wisconsin (Northwoods) has shield bedrock with deeper drilling premiums in some counties; pond loops are particularly common given freshwater abundance. Lake-effect frost lines in eastern Wisconsin (Door County, Lake Michigan shoreline) may require horizontal trenches buried 5–6 feet rather than the 4-foot national norm.
Wisconsin permits, licensing, and inspections
Wisconsin heat-exchange drillholes deeper than 25 feet must follow NR 812 and be constructed by a licensed heat-exchange driller. Advance notification and a construction report apply to ordinary qualifying projects; special cases such as 10 or more holes, depths beyond 400 feet, proximity to a municipal well, or sites in Outagamie or Winnebago County need prior DNR approval. Registered HVAC and local permit requirements also apply.
Frequently asked questions
How much does geothermal cost in Wisconsin?
The Wisconsin Public Service Commission says a system commonly costs $25,000–$30,000. Use that as a planning reference and obtain a local design plus complete bids.
How much is the 2026 Focus on Energy geothermal rebate?
The current offer is $750 with eligible electric-resistance or qualifying LP auxiliary heat and $1,000 with natural-gas auxiliary heat. Program conditions and filing deadlines apply.
Who can drill a Wisconsin geothermal loop?
A heat-exchange drillhole deeper than 25 feet must be constructed by a Wisconsin-licensed heat-exchange driller and follow NR 812.