Signs Your AC Has a Refrigerant Leak

Here is the key fact that too many homeowners never hear: an air conditioner is a sealed system. It does not consume refrigerant. So if your AC is low, refrigerant is escaping somewhere — you have a leak. Adding more each summer is treating a symptom while the problem quietly continues. Here is how to spot a leak.

The warning signs

• Weak cooling: The system runs constantly but never quite reaches the setpoint.
• Ice on the lines or coil: Low refrigerant drops coil temperature below freezing, and ice forms.
• Warm air on the hottest days: Cooling fades exactly when you need it most.
• Hissing or bubbling: A leak can make an audible sound near the coil or line set.
• Rising electric bills: A struggling system runs longer to do less.
• You’ve added refrigerant before: If it was "low" last year and is low again, that is a leak, not normal use.

Why "just top it off" is the wrong answer

Running a system low on refrigerant makes the compressor — the most expensive part of the whole system — work harder and run hotter, shortening its life. And releasing refrigerant is exactly what environmental regulations are written to prevent. Repeatedly recharging a leaking system costs you money every year and risks a compressor failure that dwarfs the price of finding the leak.

How proper leak detection works

Our refrigerant leak detection process starts by confirming the system is actually low and ruling out airflow problems. Then we locate the leak using electronic detectors and, where appropriate, nitrogen pressure testing or dye — rather than guessing. Leaks hide at the evaporator coil, the condenser coil, brazed joints, service valves, and Schrader cores. Once found, we repair it, evacuate the system, and weigh in the correct charge to specification.

Repair or replace?

An accessible joint leak on a newer system is a clear repair. A major evaporator-coil leak on an aging AC is a decision point — the coil repair can be significant, and on old equipment that money may be better put toward replacement. We give you the honest comparison rather than pushing one way.

If your cooling is fading or you have topped off before, get it diagnosed properly. We handle leak detection across Pittsburgh and Wexford. Call (831) 461-3437.

Where refrigerant leaks actually hide

Because an air conditioner is a sealed system, a low charge always means refrigerant is escaping somewhere — the job is finding where. Leaks rarely announce themselves; they weep slowly from spots that take experience and the right tools to pinpoint. That's why 'just add a pound' is a losing game: the refrigerant you add this summer leaks out by next, while the compressor runs hot the whole time.

The usual leak locations we check, in roughly the order we find them:

• The evaporator coil, where formicary corrosion causes pinhole leaks
• The condenser coil, vulnerable to physical and weather damage
• Brazed joints and connections along the line set
• Service valves and Schrader cores, which can seep at the seals
• The line set itself, especially where it passes through walls

We confirm the charge is actually low, then locate the source with electronic detection and, where needed, nitrogen pressure testing or dye — the approach behind our refrigerant leak detection service.

It is worth knowing that a brand-new system can develop a leak too. A poor flare connection or a factory defect in a coil can weep from day one, which is why we verify the charge and check for leaks at startup on every install. If a system under warranty is losing refrigerant, documenting the leak matters — it is the difference between a covered coil replacement and an out-of-pocket one.

Why 'just add a pound' is the expensive choice

Topping off a leaking system feels cheap until you add up the seasons. Each summer the refrigerant you paid for leaks back out, the compressor runs hot and undercharged the whole time, and the environmental cost mounts — all to avoid a repair that would have ended it. Finding and fixing the leak, then weighing in the correct charge to spec, costs less over any real time horizon and protects the compressor. That's the whole premise of our refrigerant leak detection service: fix the cause, not the symptom.