If your air conditioner runs and runs without cooling the house, ices up, or needed a "recharge" last summer and is weak again this summer, you almost certainly have a leak. Fallbrook Heating & Air provides AC refrigerant leak repair in Fallbrook and across North County, and refrigerant leak detection is a core part of our cooling work. The goal is simple: find the leak, fix it, and then recharge the system correctly, so you are not paying to refill it every year.
Is your air conditioner low on refrigerant?
Common signs of low refrigerant are weak or warm airflow, a system that runs far longer than normal, ice on the larger copper line or the indoor coil, a hissing or bubbling sound near the lines, and rising electric bills. Because an AC is a sealed system, low refrigerant always means there is a leak somewhere.
- Air from the vents is cool but not cold, especially in the afternoon
- The system runs for hours and never reaches the thermostat setting
- Frost or ice on the insulated suction line at the outdoor unit, or on the indoor coil
- Hissing or gurgling near the outdoor unit or the indoor coil
- Water dripping as ice on the coil melts
- An AC that was "topped off" before and is struggling again
Some of these overlap with airflow problems such as a clogged filter, so check the filter first. If it is clean and the symptoms continue, book a visit; running a system low on charge can overheat and damage the compressor.
Why does an air conditioner leak refrigerant?
Refrigerant leaks usually come from small holes in the indoor or outdoor coil, worn valve cores at the service ports, loose or cracked fittings, and spots where copper lines rub against something as the unit vibrates. Corrosion causes many coil leaks, and near the coast, salt air speeds that up on outdoor coils.
Coil corrosion
Indoor coils can develop pinhole leaks from corrosion over time. Outdoor coils in Oceanside and Carlsbad also face salt air, which attacks fins and tubing faster than inland air does.
Vibration and rub points
Copper lines that touch the cabinet, another pipe or a wall bracket slowly wear through. These are often the easiest leaks to fix.
Fittings and service valves
Valve cores and caps at the service ports, and brazed or flared joints, can all seep over time. Missing service port caps are a surprisingly common contributor.
How do we find a refrigerant leak?
We start by measuring the system's pressures and temperatures to confirm the charge is actually low. Then we search the likely spots, the coils, service valves, fittings and line set, using leak-detection tools and methods suited to the system. Once the leak is located, you get the repair options and costs before work begins.
- Confirm the problem. Pressures, temperatures and airflow are checked so we do not chase a leak that is really a dirty filter or a failing fan motor.
- Search. Accessible coils, fittings, valves and line set are checked with leak-detection tools.
- Explain. You hear where the leak is and what fixing it involves: a valve core, a brazed joint, a line set section, or a coil.
- Repair and test. After the repair, the system is checked for tightness before refrigerant goes back in.
- Charge correctly. The system is charged to the manufacturer's specification, not by guesswork, and its performance is verified.
“Quick and honest service. Jesse was great. A real pro!”
What do R-410A and R-454B mean for your repair?
If your system uses R-410A, it can still be serviced and repaired with R-410A. New residential split systems made since January 1, 2025 use A2L refrigerants, mainly R-454B or R-32. The two types cannot be mixed, and an R-410A system cannot simply be converted to R-454B, so repairs keep the original refrigerant.
| R-410A | R-454B | |
|---|---|---|
| Where you find it | Most central AC and heat pump systems installed before 2025 | New residential split systems made from January 1, 2025 (R-32 is the other common choice) |
| Safety class | A1 (non-flammable) | A2L (lower flammability), with equipment designed for it |
| Can existing systems be serviced? | Yes | Yes |
| Can the two be mixed or swapped? | No. Each system uses only the refrigerant it was designed for | |
In May 2026 the EPA removed the January 1, 2026 installation deadline for R-410A equipment manufactured before 2025, so remaining R-410A units can still be installed. Our guide to the R-410A phase-down and R-454B covers the details and sources.
Which refrigerants do you work on?
Most of what you'll find in North County homes. We work on R-410A, the older R-22, R-407C, R-422B and R-427A, and the newer A2L refrigerants. We install new systems on both R-454B and R-32, and we keep R-410A, R-32, R-454B, R-427A and R-407C on hand, so a repair usually doesn't wait on refrigerant.
If your system is old enough to use R-22, it can still be repaired, but R-22 is no longer made, so a large leak on an R-22 system is usually the point to talk about replacement.
Should you repair the leak or replace the system?
Fix the leak when it is in an accessible fitting, valve or line, or when the system is fairly young. Replacement deserves a serious look when an older system has a leaking coil, when leaks keep returning in new places, or when the compressor has been damaged from running low. We will lay out both options honestly.
Replacing just a coil on an older R-410A system can be good value, or it can be money spent on a system with other parts near the end of their life. Our guide to repairing or replacing an AC walks through the decision, and central air replacement estimates are free; see AC installation.
“Quick response, professional advice, quick service, problem solved!”
Where we work
We find and fix refrigerant leaks across North County: coastal homes in Oceanside and Carlsbad, where salt air is hard on outdoor coils, and inland systems in Escondido and Fallbrook that work through long, hot summers. Regular maintenance catches many small leaks early. Call (760) 728-8716 to book.
Frequently asked questions
Is "Freon" the same as refrigerant?
Freon is an old brand name that people use for any AC refrigerant. Most central air systems installed over roughly the past fifteen years use R-410A, and new systems made since January 2025 use A2L refrigerants such as R-454B or R-32. The refrigerant type is printed on the outdoor unit's data plate.
Is leaking refrigerant dangerous to my family?
Small leaks from a home AC escape outdoors or into the attic in tiny amounts and are not usually a health concern, but refrigerant should never be released on purpose. If you smell something unusual near the indoor unit, or hear a loud hiss after an impact, turn the system off and call us.
Can I add refrigerant myself?
No. Central AC refrigerants must be handled by trained technicians under EPA rules, and adding refrigerant without measuring the charge often overfills or underfills the system. It also leaves the leak in place. A proper repair finds the leak, fixes it, then charges the system to the manufacturer's specification.
Will my old R-410A system be impossible to service soon?
No. R-410A systems can still be serviced and repaired. The rules changed what new equipment is made with, not whether existing systems can be maintained. In May 2026 the EPA also removed the January 2026 installation deadline for R-410A equipment made before 2025, so the transition is more gradual than first planned.
Rather we call you?
Leave your name and number and we'll call you back.