Kosciusko County Looks to Us for Geothermal Heating & Cooling! We're Gast Heating & Cooling Inc.. And we're recognized throughout Kosciusko County, Indiana, for our geothermal heating and cooling expertise. Residents turn to us for ... superior geothermal system installation and service qualified, highly trained personnel who know every detail of geothermal heating and cooling - and know how to help you understand geothermal systems from one of the industry's most trusted names - WaterFurnace professional instructions on how to get the most from their geothermal heating and cooling installation Of course, a pivotal reason people turn to us in the first place is for the savings they can get on their energy bills with a geothermal system. Want a snap shot? Give our Geothermal Savings Calculator a go. Then take the next step and contact Gast Heating & Cooling Inc.. We'll walk you through more of what makes geothermal systems the best choice for year-round heating and cooling comfort in Kosciusko County.