Marysville, Ohio, Geothermal Heating & Cooling We're getting the word out in Marysville, Ohio: in in the condition the economy is in today, geothermal heating and cooling is absolutely the right choice! Ground conditions in Marysville are perfect. How about our seasonal temperatures? They vary enough in extremes to practically guarantee that geothermal heating and cooling will offer the best year-round satisfaction. You'll also enjoy how much a geothermal system can cut your energy expenses, too. The proof? Our Geothermal Savings Calculator. Contact Geo Source One Inc. today. We've got a lot more to discuss with you about the advantages of geothermal heating and cooling in Marysville. Best of all, we install and service WaterFurnace geothermal systems, the finest on the market.