Any metal that comes into contact with water in the presence of oxygen can rust. So the short answer to the question in the title is, yes. Rust on an AC is more likely to happen in a place like coastal Florida because of our high humidity and the amount of salt in the air. The outdoor components of your home’s air conditioning system are in regular contact with moisture and salt, and this can lead to parts of it rusting.
The good news is that AC manufacturers build their systems to resist rust for many years. It can still occur, however, and we’re going to take a look at what can happen when you’ve got a rusty AC and what you can do about it.