Blue Fin coating is a specialized anti-corrosive layer applied to the Evaporator Coil of our mini-split units. It helps the coil shed water more quickly during the cooling mode, which prevents odors and improves efficiency. This coating also protects the delicate aluminum from oxidation and salt air, similar to our Gold Fin technology. You will find this feature across our One Zone Wall Mount and multi-zone systems. It is a hallmark of Professional Grade equipment designed for long-term durability. By keeping the coil clean and dry, Blue Fin technology helps maintain high indoor air quality. You can find more about our coil coatings in the Series Info section for Cooper&Hunter. It’s a small detail that makes a big difference in your daily comfort.