Salt Air and Your Outdoor Unit

What corrosion actually attacks

• The condenser coil fins, where corrosion reduces the surface area available to shed heat
• The cabinet and fasteners, which is mostly cosmetic until it is not
• Electrical connections at the contactor and disconnect, where corrosion causes intermittent faults that are genuinely hard to chase
• The fan motor shaft and bearings

What slows it down

• Rinsing the outdoor coil with fresh water periodically — with the power off at the disconnect
• Keeping landscaping back so the unit gets airflow and dries out
• Annual professional cleaning and an electrical inspection at the contactor and disconnect
• Not enclosing the unit in a tight screen or cabinet that traps damp air around it

What to expect on lifespan

Coastal equipment tends to age faster than the same model inland. That is worth knowing when you weigh a large repair on an older coastal system — the remaining life is often shorter than the calendar suggests.

The intermittent-fault warning

Corroded connections cause faults that come and go, which is the most frustrating kind. If your system works some days and not others near the coast, the electrical connections at the outdoor unit are worth checking before anything more exotic.