Knox County, Ohio, Geothermal Heating & Cooling We're spreading the word throughout Knox County, Ohio: in in the condition the economy is in today, geothermal heating and cooling is absolutely the right choice! Soil conditions in Knox County are perfect. How about our seasonal temperatures? They vary enough in extremes to almost guarantee that geothermal heating and cooling will provide the best year-round satisfaction. You'll also enjoy how much a geothermal system can cut your energy costs, too. The proof? Our Geothermal Savings Calculator. Contact Cosby Heating and Cooling today. We've got a lot more to tell you about the advantages of geothermal heating and cooling in Knox County. Another great thing, we install and service WaterFurnace geothermal systems, the finest on the market.