We're Ferdinand's Primary Geothermal Contractor! Ferdinand, Indiana, residents have all kinds of reasons for wanting a geothermal heating and cooling system: phenomenal year-round comfort – no matter how extreme the seasonal variations stable operating performance energy efficiency (They’d be hard-pressed to find a more "green," more natural way to heat and cool their homes!) significant – often amazing – savings on their energy bills superior installation and service from Hulsman Refrigeration, Inc., Ferdinand's geothermal professionals. Learn more about what a geothermal heating and cooling system can do to improve your family's comfort. Look at our Geothermal Savings Calculator. Then contact Hulsman Refrigeration, Inc.. We sell, install, and service WaterFurnace geothermal systems, the very best on the market today.