We're Olivet's Primary Geothermal Contractor! Olivet, Michigan, residents have all sorts of reasons for wanting a geothermal heating and cooling system: phenomenal comfort all year – no matter how crazy the weather variations stable operating performance energy performance (They’d be hard-pressed to find a more "green," more natural way to heat and cool their homes!) significant – often extraordinary – savings on their energy bills premium installation and service from S&J Heating and Insulation, Inc., Olivet's geothermal professionals. Discover more about what a geothermal heating and cooling system can do to improve your family's comfort. Check out our Geothermal Savings Calculator. Then contact S&J Heating and Insulation, Inc.. We sell, install, and service WaterFurnace geothermal systems, the very best on the market today.