Westerville, Ohio, Geothermal Westin Air is the finest WaterFurnace geothermal contractor in Westerville, Ohio. We'll help you comprehend all the benefits of geothermal heating and cooling. We’ll see to it that your WaterFurnace system is properly installed, too. And when it comes time for service? Nobody in Westerville can beat our service! Contact Westin Air today. Like a little sneak-peek at the savings a WaterFurnace geothermal heating and cooling system can provide? Use our simple Geothermal Savings Calculator.