About Air & Heat Service Co. Your Premier Geothermal Source in Northern Mississippi You can count on Air & Heat Service Co. for all your WaterFurnace geothermal heating and cooling system needs, including ... planning assistance complete comfort system installation routine service and maintenance emergency repair energy-saving advice and consultation Our fully trained professional staff is dedicated to the complete satisfaction of customers throughout Northern Mississippi. After all, you've chosen the finest heating and cooling system available. We make sure that system continues to live up to your expectations, improving your home's efficiency and helping you cut energy costs. Contact Air & Heat Service Co. today to get a free estimate and a cost savings analysis for your home.