Hilliard, Ohio, Geothermal Heating & Cooling We're getting the word out in Hilliard, Ohio: in in the condition the economy is in today, geothermal heating and cooling is definitely the right choice! Ground conditions in Hilliard are perfect. How about our seasonal temperatures? They fluctuate enough in highs and lows to virtually guarantee that geothermal heating and cooling will provide the best year-round satisfaction. You'll love how much a geothermal system can cut your energy costs, too. The proof? Our Geothermal Savings Calculator. Contact Westin Air today. We've got a lot more to tell you about the benefits of geothermal heating and cooling in Hilliard. Another great thing, we install and service WaterFurnace geothermal systems, the finest on the market.