Keeping HVAC Alive at the Jersey Shore

Salt is the main event

Chloride in sea air attacks the aluminum fins and copper tubing of a condenser coil, concentrating at the joint between the two metals. It works continuously, and it works from the outside in — which is why a shore system can look perfectly sound and still be finished.

The failure presents as a refrigerant leak, because that is literally what it becomes when corrosion perforates the coil.

Rinse it, several times a season

The single most effective thing a shore homeowner can do, and it is free. Salt deposits sit on the fins and keep working; fresh water removes them. Switch off at the disconnect, then use a garden hose from the inside of the coil outward. Never a pressure washer — it folds the fins flat and does more damage than the salt would.

Specify the coil properly when you replace

Coated coils and all-aluminum microchannel designs — which remove the dissimilar-metal joint entirely — both resist chloride far better than standard construction. The uplift is small against replacing a system years early, and it is rarely the default on a quote unless the contractor works the shore routinely. Ask for it specifically.

Do not wrap it for winter

The most common well-intentioned mistake here. A fitted cover over the whole unit keeps rain out and humidity in, so the fins stay permanently damp and the salt already on them stays wet and active. It also makes an excellent rodent house. A top-only cover that leaves the sides open is fine; most manufacturers say no cover is needed at all.

Seasonal occupancy is the second problem

A house shut from October to May fails differently from one lived in year-round.

Things fail on the first hot weekend

Not gradually. A system that has not run since September is asked to work hard on Memorial Day weekend, and that is when capacitors, contactors and seized fan motors reveal themselves. It is also the worst weekend of the year to find a technician anywhere on the shore.

Book a start-up, not a mid-season service

The single most useful scheduling decision for a seasonal property: have the system started and checked in April or early May, before the season, rather than serviced at some point during it. It converts an emergency into an appointment.

Humidity while the house is closed

A shut house in a humid coastal summer grows mold. Leaving the system set to a high temperature — rather than off entirely — or running a standalone dehumidifier protects the interior, and costs far less than remediation.

Flooding and elevation

The third factor, and the one that changed after 2012.

Equipment that has been in salt water is finished

Not "should be checked" — finished. Salt water in an outdoor unit or an indoor air handler compromises electrical components, contactors and bearings even when it runs afterwards, and the failures arrive later. Have it assessed before it is powered up, and photograph everything for insurance before anything is moved.

Elevated mechanicals are now normal here

Flood rules changed after Sandy and a great deal of rebuilt shore equipment sits above grade — condensers on platforms, air handlers moved out of crawl spaces and into attics or upper floors. If you are replacing equipment in a flood-prone area, elevation is worth doing at the same time even where it is not strictly required, because the alternative is doing it after the next event.

Attic air handlers bring their own issue

Moving an air handler to an attic solves flooding and introduces condensate. A drain pan, a float switch and a secondary drain are not optional up there — a blocked primary drain over a finished ceiling is an expensive way to find out.