When properly matched and installed, your communicating DX18TC Air Conditioner offers up to 19 SEER high-efficiency performance. The higher the SEER, the greater the efficiency — and the lower the operating cost compared to lower SEER units. In many applications, the efficiency of your DX18TC can be enhanced by using it in conjunction with a Daikin brand gas furnace that includes a variable-speed blower motor. This unit features a powder-paint finish over heavy-gauge galvanized steel that provides premium durability and excellent UV protection.