Refrigerant Leaks Explained: The Causes, Signs, and Solutions

Refrigerant leaks are one of the most common reasons we get called out to homes across Philadelphia, Bucks County, and Montgomery County during the summer. Your AC runs, but the air never gets cool. And the problem only gets worse over time.

At Angel Heating and Cooling, our technicians diagnose and repair these leaks throughout the Greater Philadelphia area every season. Catching a leak early prevents compressor failure and protects your system.

TL;DR

A refrigerant leak stops your AC from cooling properly and leads to compressor failure if ignored. The most common causes are corroded coils, damaged refrigerant lines, and faulty fittings. Refrigerant leak repair requires a licensed HVAC technician. This is not a DIY fix.

Key Takeaways

Refrigerant leaks are a leading cause of an AC not cooling in Philadelphia-area homes
Low refrigerant does not refill itself—the leak must be found and repaired
R-22 is now banned under current regulations, and R-410A is the active standard

What Causes Refrigerant Leaks?

These leaks develop for several reasons. These are the most common sources we find during service calls across Philadelphia and Warminster.

Corroded evaporator coil
Damaged lines
Loose fittings and faulty connections
Condenser coil damage

Refrigerant Leak Symptoms

AC is not cooling your home

If your system runs continuously but never reaches the set temperature, low refrigerant is one of the first things to rule out. Without a proper charge, the system cannot transfer heat efficiently. This is the most common complaint we hear before diagnosing a leak.

Ice forming on the unit

When refrigerant levels drop, pressure inside the evaporator coil falls, and the surface freezes the condensation forming on it. If you see ice on your system, shut it off immediately. Running an iced unit damages the compressor quickly.

Hissing or bubbling sounds

A hissing sound near your indoor or outdoor unit often means refrigerant is escaping under pressure. Bubbling or gurgling may indicate that air has entered the line. Either warrants an immediate inspection.

Rising energy bills

Low refrigerant forces your system to run longer cycles to reach your target temperature. If cooling costs are climbing without changes in usage, a leak is worth investigating.

2026 Refrigerant Regulations

R-22, once standard in older systems, is now banned from production and import under EPA regulations. If your older system uses R-22 and develops a leak, it may mean replacing the unit rather than recharging it, as R-22 is now scarce and expensive.

R-410A is the current standard and fully serviceable. If your system is more than 10–15 years old, our technicians can help you understand whether AC repair or replacement makes more financial sense.

FAQs

What causes refrigerant leaks in air conditioners?

The most common causes are corrosion on the evaporator or condenser coil, wear along the refrigerant lines, and loose or degraded fittings. Older systems are especially susceptible to formicary corrosion, which creates pinholes in copper coils over time.

What are the most common refrigerant leak symptoms?

An AC not cooling effectively, ice on the unit or lines, a hissing sound near the system, and unexplained increases in energy bills. If multiple symptoms are present, the system should be inspected as soon as possible to prevent compressor damage.

Why is my AC leaking refrigerant even after it was just recharged?

Recharging without repairing the leak is only a temporary fix. The refrigerant will continue escaping through the same opening. The only lasting solution is to locate the leak, repair or replace the damaged component, and then restore the correct charge.

How much does refrigerant leak repair cost?

The cost depends on the location and severity of the leak. A fitting repair costs far less than an evaporator coil replacement. At Angel Heating and Cooling, we provide a clear, upfront estimate before any work begins. We also offer special financing for 72 months, subject to approved credit.

Schedule Repair with Angel Heating and Cooling

If your AC is not cooling your home the way it should, don’t wait. Delaying repair risks compressor failure, which is one of the costliest repairs in HVAC.

Angel Heating and Cooling has served homeowners across Philadelphia, Bucks County, and Montgomery County for over 20 years. We’re available 365 days a year, offer same-day service, and back our work with up to a 12-year parts and labor warranty. As a Google Guaranteed business with an A+ BBB rating and 4.8 Google rating, we’re built on honest, upfront service.