AC Repair in New Jersey

Why is my air conditioner running but not cooling?

The system is doing half its job: the indoor blower is moving air, but heat is not being moved out of the house. Four causes account for most of it, and it is worth knowing which are cheap.

A blocked filter, which is free to fix

Restricted airflow across the evaporator coil drops the coil temperature until it freezes, and a frozen coil moves no heat at all. The symptom is a system that ran fine for an hour and then stopped cooling, sometimes with ice visible on the copper line at the indoor unit. Change the filter, switch the system to FAN ONLY for two hours to thaw it, then try again. A surprising share of "broken" air conditioners are this.

A dirty condenser coil

The outdoor unit rejects the heat, and it cannot do that through a coil packed with cottonwood seed, grass clippings and dust. Late June in New Jersey is peak cottonwood, and it mats onto a coil like felt. The system runs constantly, the house never quite reaches setpoint, and the electricity bill climbs. Switch the power off at the disconnect and rinse the coil from the inside outward with a garden hose — not a pressure washer, which folds the fins flat.

A failed capacitor or contactor

These are the cheap electrical parts that start and switch the compressor and fan. A failed run capacitor is the single most common genuine repair on a residential air conditioner. The tell is a humming outdoor unit whose fan is not turning, or a system that trips the breaker on start. Both parts are inexpensive and quick.

Low refrigerant, which means a leak

This is the one to understand properly. Refrigerant is not consumed — it circulates in a sealed system. A system that is low has a leak, and topping it up without finding that leak is buying the same repair again next summer, at the same price, plus the refrigerant. Anyone who adds refrigerant without proposing a leak search is selling you a temporary result.

Why New Jersey shore equipment fails early

This is the part that does not apply inland. Salt-laden air corrodes an outdoor condenser from the outside in, and the aluminum fins and copper tubing of the coil go first. A system in Ocean City or Long Branch routinely reaches end of life at eight to twelve years where the identical unit in Bridgewater runs past fifteen.

It presents as a refrigerant leak, because it is one

Corrosion eats through the thin aluminum at the fin-to-tube joint and the charge escapes. The homeowner experiences a system that gradually cools less well over a season, then stops. A technician finds it low on charge. The underlying cause is the air, and adding refrigerant to a corroded coil is money into a coil that will leak again within months.

What actually helps

Rinsing the coil with fresh water several times through the season genuinely extends its life, and it is the single most effective thing a shore homeowner can do. At replacement, specify a coated or corrosion-resistant coil — the uplift is small against the cost of replacing the system years early. What does not help is a fitted cover left on through the season, which traps moisture against the fins and accelerates exactly what it is meant to prevent.

Repair or replace?

The rough test is age against the cost of the repair, with two findings that settle it on their own.

Under about ten years

Repair almost always wins. The equipment has most of its life left and the repair is a fraction of replacement. The exception is a compressor failure, which on any system is expensive enough to reopen the question.

Past fifteen, or still running R-22

R-22 was phased out of production and import in the United States at the start of 2020. Systems using it still run legally on reclaimed stock, but that stock is finite and priced accordingly — a significant leak repair on an R-22 system frequently costs more than the system is worth. Check the data plate on the outdoor unit. If it says R-22 and the system is low on charge, replacement is usually the honest answer.

A cracked or corroded evaporator coil

On an older system this is close to a replacement decision by itself, because the coil is a substantial part of the cost and fitting a new one to ageing equipment rarely makes sense. Get it quoted both ways before deciding.

What else goes wrong

Beyond the four main causes, a handful of faults come up often enough to name.

Water where it should not be

Cooling produces condensate and it has to drain. A blocked drain line fills the pan until it overflows; most systems have a float switch that shuts the unit down first, so a system that has simply stopped in humid weather is often reporting this. It is a quick fix and a genuinely common one in New Jersey's humid summers.

Tripping the breaker

Never keep resetting it. A breaker trips because something is drawing more current than the circuit allows — a failing compressor, a shorted fan motor, or a failed capacitor making a motor work far harder than it should. All of those need a meter.

Cold but clammy

If the house hits temperature quickly and still feels damp, the system is very likely oversized. It satisfies the thermostat before it has run long enough to remove humidity. That is a sizing problem rather than a fault, and turning the thermostat down makes it worse.