The humidity on Delmarva can have some devastating effects on pianos. Rusting strings and pins, sluggish actions & keys, even mold and mildew. Here’s a relatively new(under 15 years old) Young Chang Studio that lives near the Wicomico River.
That’s some pretty significant rust in a piano that’s not that old. I’ve installed a Piano Life Saver System(dehumidifier and humidistat) to dry out the environment inside the piano.
Here’s the system installed. It won’t correct the rust that’s already occurred, but will keep it from getting any worse.