Like any piece of machinery or machine component, air-conditioning coils work better, and last longer, when properly cared for.
That means regularly cleaning indoor and outdoor a/c coils, plugging tiny leaks when possible, and sometimes using proper coatings that inhibit corrosion, especially when coils are to be used in environments that subject them to harsh conditions, such as in coastal regions or near swimming pools, food-processing plants, and even airports.