Trane claims that its All-Aluminum Comfort™ Coils are the best in the market, and the numbers go along with their claims. For starters, the cased coil is AHRI matched with the gas furnace allowing the gas system to achieve the coveted 16 SEER rating. The advantage from this is almost immediate and you can definitely feel it in the air. Once the coils have been installed with the gas furnace, you are going to receive the most comfortable air at the highest efficiency throughout the year. And, the cabinets are 100% foil-backed for easy cleaning as well as quiet operation. If you wrap all this in the neat little package that is the 4 Ton Trane Coil, you will have the perfect gas system for your home.