We're the Geothermal Source in Rochester! Rochester homeowners in the know look to Johnson Comfort Systems, Inc. for all their geothermal heating and cooling needs. They trust us to provide not only the correct installation and service but also the experience to help them maximize the potential from their geothermal systems. Considering a geothermal system of your own? Give our nifty little Geothermal Savings Calculator a whirl. Just fill-in your data and stand in awe of the results. Then, contact us, the Rochester, Minnesota, geothermal professionals at Johnson Comfort Systems, Inc..