Byhalia Geothermal Heating & Cooling Contractor In Byhalia, Mississippi, the geothermal heating and cooling contractor to call is Air & Heat Service Co.. Our geothermal expertise is second to none. And we offer the best products available in Byhalia - or anywhere else, for that matter: geothermal heating and cooling systems! Try our Geothermal Savings Calculator. It'll show you the best reason for going geothermal. The monthly savings are huge! We can tell you plenty of other good reasons, too. And when you’re ready install? We'll see to it that your geothermal heating and cooling system is installed - and serviced – correctly! Contact Air & Heat Service Co. today.