We're the Geothermal Source in Sandusky! Sandusky homeowners in the know turn to Kozy Home Heating & Cooling (aka AllTemp Comfort) for all their geothermal heating and cooling needs. They count on us to provide not only the proper installation and service but also the insight to help them maximize the potential from their geothermal systems. Thinking about 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 Sandusky, Michigan, geothermal professionals at Kozy Home Heating & Cooling (aka AllTemp Comfort).