About
Don-Martin Heating, Cooling & Geothermal Inc. is a geothermal and HVAC specialist based at 4101 Commercial Drive in Janesville, Wisconsin, serving residential and light commercial clients across southern Wisconsin. The company provides geothermal heat pump installation and service along with furnace, air conditioning, and boiler work for Rock County and neighboring counties including Walworth, Dane, Jefferson, and Green. Don-Martin is a registered Focus on Energy Trade Ally, qualifying customers for Wisconsin energy efficiency rebates and incentives on qualifying high-efficiency equipment. The service territory spans the greater Janesville-Beloit corridor and extends toward the Madison metro area, covering both new geothermal installations and ongoing maintenance for existing ground-source systems. Verified active operator per focusonenergy.com Trade Ally directory + Yelp listing updated May 2026 — WI bundle audit 2026-06-02
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Don-Martin Heating, Cooling & Geothermal Inc. — Janesville, Wisconsin
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