How salt air wears out an outdoor unit, and how to slow it down.

Why the coast is harder

Salt in the air settles on coils, fins and cabinets and speeds up corrosion. Fog and wind carry it farther inland than you'd expect. Equipment close to the beach tends to show it first.

At install time

• Ask whether the unit is available with a coastal or corrosion resistant coating, and what the warranty says about coastal locations.
• Place the unit out of direct wind and spray where you can, with the clearance the manufacturer requires.
• Use corrosion resistant fasteners, pads and supports.
• Keep the unit off soil and away from sprinklers.

Ongoing care

• Rinse the outer coil gently with a hose, with the power off, a few times a year.
• Keep plants trimmed back and leave two feet of clearance.
• Book a yearly tune up so a technician can check the coil and cabinet.
• Touch up chips in the paint before rust sets in.

Check the warranty

Some manufacturers limit coverage for corrosion near salt water. Ask and read it before you decide. We tell you what we see on a site visit.