We're the Geothermal Source in Dubois County! Dubois County homeowners in the know turn to Hulsman Refrigeration, Inc. for all their geothermal heating and cooling needs. They place their confidence in us to provide not only the proper installation and service but also the experience to help them get the most from their geothermal systems. Considering a geothermal system of your own? Give our nifty little Geothermal Savings Calculator a whirl. Just load it with your data and marvel at the results. Then, contact us, the Dubois County, Indiana, geothermal experts at Hulsman Refrigeration, Inc..