We're the Geothermal Source in Horn Lake! Horn Lake people in the know turn to Air & Heat Service Co. for all their geothermal heating and cooling needs. They trust us to provide not only the proper installation and service but also the insight to help them get the most from their geothermal systems. Thinking about a geothermal system of your own? Give our nifty little Geothermal Savings Calculator a try. Just load it with your data and stand in awe of the results. Then, contact us, the Horn Lake, Mississippi, geothermal experts at Air & Heat Service Co..