In this article…
- What Are the Signs Your AC May Be Low on Refrigerant?
- What Causes an AC Refrigerant Leak?
- Does Low Refrigerant Always Mean You Have a Leak?
- Does an AC Normally Lose Refrigerant?
- Can You Just Add Refrigerant Instead of Fixing the Leak?
- What Should You Do If You Think Your AC Is Leaking Refrigerant?
- Frequently Asked Questions About AC Refrigerant Leaks
Is your AC constantly running, but your home still feels warm? Do you keep cranking down the thermostat, hoping to get some relief from the heat?
The problem may be that your HVAC system has a refrigerant leak.
While low refrigerant can cause cooling problems, refrigerant isn’t something your air conditioner normally uses up over time.
Your AC is designed to operate with a specific amount of refrigerant circulating through a closed system. If that amount becomes significantly low, there’s usually a reason, and a refrigerant leak is one possibility that should be investigated.
At Wright Home Services, our team of certified technicians is here to provide you with all the information you need to understand your HVAC system and make the best decisions for your home.
If you’ve been having comfort issues and suspect something is wrong with your HVAC system, you want to get to the bottom of it. We’re here to help.
So, how can you tell if your AC might be low on refrigerant? And if you do have a leak, what should you do about it?
Let’s walk through the common signs, what causes refrigerant leaks, and what your options may be if a leak is found.
What Are the Signs Your AC May Be Low on Refrigerant?
Low refrigerant affects your air conditioner’s ability to remove heat, which can make it harder for the system to cool your home.
However, many of the symptoms of low refrigerant can also be caused by other AC problems. These warning signs can tell you that something isn’t working correctly, but they can’t confirm a refrigerant problem on their own.
Here are some of the most common signs your AC system may be low on refrigerant.
1. Your AC Isn’t Cooling Properly
One of the most noticeable signs is an AC that runs but doesn’t seem to cool your home like it normally does.
You might notice that the temperature inside stays several degrees above your thermostat setting or that certain rooms aren’t getting as comfortable as they used to.
Low refrigerant is one possible cause, but poor airflow, dirty equipment, ductwork problems, failing components, and other issues can create similar symptoms.
2. Warm or Lukewarm Air Is Coming From Your Vents
When you put your hand near a supply vent while the AC is running, the air should feel noticeably cooler than the room.
If the air feels warmer or more lukewarm than usual, the system may not be removing enough heat from your home’s air.
Again, that doesn’t automatically mean you’re low on refrigerant, but it is a reason to have the system checked.
3. Your AC Runs for Long Periods
When an AC isn’t cooling effectively, it may continue running as it tries to reach the temperature you’ve set on the thermostat.
You may notice unusually long cooling cycles or an AC that seems to run almost constantly during the day.
Some extended runtime is normal during extremely hot weather, especially when outdoor temperatures are well above your thermostat setting. But if your AC’s runtime has noticeably changed or it can no longer maintain temperatures it previously could, there may be a problem.
4. There’s Ice on the AC Coil or Refrigerant Lines
Ice forming on your air conditioner is a sign that something isn’t operating correctly.
Low refrigerant can cause the evaporator coil to become too cold, allowing moisture on the coil to freeze. You may notice ice on the refrigerant line, around the indoor equipment, or on the evaporator coil itself.
However, low refrigerant isn’t the only cause of a frozen AC. Restricted airflow from a dirty filter, blower problems, or other issues can also cause the coil to freeze.
If your AC is frozen, turning the cooling off and having the system inspected is generally better than continuing to run it.
5. You Hear Hissing or Bubbling Sounds
Some refrigerant leaks can create unusual sounds.
A hissing noise may occur when refrigerant escapes through a small opening, while bubbling or gurgling can sometimes occur depending on the location and nature of the leak.
Not every refrigerant leak will make an obvious sound, and HVAC systems can make noises for many other reasons. But a new hissing sound combined with cooling problems is worth having inspected.
6. Your AC Has Trouble Keeping Up on Hot Days
Sometimes an AC problem isn’t as obvious until temperatures climb.
Your system may seem to work adequately in the morning or evening but struggle to maintain your thermostat setting during the hottest part of the afternoon.
However, an undersized system, poor insulation, duct problems, dirty equipment, or extreme outdoor temperatures can also contribute to an AC struggling during hot weather.
What Causes an AC Refrigerant Leak?
Refrigerant travels through multiple coils, lines, fittings, valves, and connections. A leak can develop anywhere along that path.
Some common causes include:
Corrosion
Over time, corrosion can weaken metal components and eventually create small openings that allow refrigerant to escape.
The evaporator coil is one area where corrosion-related leaks can develop as equipment ages.
Vibration and Normal Wear
Your AC contains moving components and experiences vibration every time it operates.
Over many years, repeated vibration and normal wear can put stress on refrigerant lines, joints, and connections.
Loose or Damaged Connections
Refrigerant lines have multiple fittings and connection points.
If a connection becomes loose or damaged, refrigerant has a way to escape from the system.
Damaged Refrigerant Lines
The copper lines running between your indoor and outdoor equipment can become damaged.
Accidental physical damage, rubbing against another surface, improper installation, or long-term wear can eventually create a leak.
Evaporator Coil Leaks
The evaporator coil is located inside your home and plays a major role in removing heat from indoor air.
Because of its construction and operating environment, leaks can sometimes develop within the coil itself. Depending on the location and extent of the damage, replacing the evaporator coil may be more practical than attempting to repair it.
Condenser Coil Leaks
Your outdoor condenser coil can also develop refrigerant leaks.
Physical damage, corrosion, vibration, and age can all contribute to leaks in the outdoor equipment.
Improper Installation
Improperly made connections, poor brazing, damaged tubing, or other installation issues can potentially create refrigerant leaks.
These problems may become apparent shortly after installation or develop over time.
Does Low Refrigerant Always Mean You Have a Leak?
Not necessarily. A refrigerant leak is a common reason an AC becomes low on refrigerant, but a technician should diagnose the system before assuming that’s the problem.
Here are a few of the most common reasons why your system may be low on refrigerant.
1. The System Wasn’t Charged Correctly
An air conditioner needs a specific refrigerant charge to operate as designed.
If the system wasn’t charged correctly during installation or previous service, it could be undercharged even without an active leak.
2. The AC Was Recently Serviced
If work was recently performed on the refrigerant circuit, the charge may need to be reevaluated as part of diagnosing the problem.
This is one reason it’s helpful to tell your technician about recent repairs or AC work.
3. There Is a Refrigerant Leak
If your system was previously charged correctly and has since lost refrigerant, a leak becomes a likely explanation.
The next step is determining where the refrigerant is escaping and whether repairing the leak makes sense.
4. The Problem Isn’t Refrigerant at All
Many common AC problems can look like low refrigerant.
Restricted airflow, a dirty evaporator coil, blower problems, duct issues, thermostat problems, and failing components can all affect cooling performance.
That’s why simply looking at a symptom and assuming the AC “needs Freon” can lead you in the wrong direction.
Does an AC Normally Lose Refrigerant?
No. Under normal operating conditions, your AC should not regularly lose refrigerant.
Refrigerant circulates through a closed-loop system, moving between your indoor and outdoor AC components. Its job is to absorb heat from inside your home and release that heat outdoors.
While it changes between liquid and gas during this process, the refrigerant itself isn’t consumed.
Think of it differently than gasoline in your car. Your car burns fuel and eventually needs more. Your air conditioner continually circulates the same refrigerant.
That means you shouldn’t need to schedule a refrigerant top-off every summer as part of routine AC maintenance.
Can You Just Add Refrigerant Instead of Fixing the Leak?
Adding refrigerant may restore cooling temporarily, but it doesn’t repair the opening that allowed the refrigerant to escape. That’s an important distinction.
If a technician adds refrigerant to a leaking system without addressing the source, the new refrigerant may eventually escape too.
How quickly that happens depends on the leak.
A very small leak could cause refrigerant to escape slowly, while a larger leak could result in the system becoming low again much sooner. There’s no universal answer to how long a top-off will last when an active leak is present.
Repeatedly adding refrigerant can also become expensive. If you’re paying to recharge the same system over and over, eventually those costs can add up without actually solving the underlying problem.
That’s why the better question usually isn’t whether you can add more refrigerant, but more so why the system is low on refrigerant in the first place.
Once you know the answer, you can make a more informed decision about whether to repair the leak, replace a component, or consider replacing the system.
What Should You Do If You Think Your AC Is Leaking Refrigerant?
Your AC is designed to circulate refrigerant within a closed system. So, if the refrigerant level is low, adding more may only address the symptom, not the reason it became low in the first place.
Have the system properly diagnosed before assuming it simply needs a recharge or repair.
If a refrigerant leak is found, ask where the leak is, what it will take to repair it, how much the complete repair will cost, and whether fixing the existing system makes sense based on its age and condition.
A technician can determine whether the AC is actually low on refrigerant and look for other problems that could be causing similar symptoms.
If there’s one thing to remember, it’s that your air conditioner shouldn’t normally need refrigerant added every year.
If you’ve been experiencing cooling issues, it’s possible your system is low on refrigerant. But there are also several other things that could be going on that are causing your comfort to decline.
Before calling a professional, check out this article that provides a step-by-step guide to identifying and troubleshooting common AC problems, what may be going on with your system, and when to call a professional.
Does your system need attention? Schedule your $44 AC check with Wright Home Services today!
Frequently Asked Questions About AC Refrigerant Leaks
How Long Will Refrigerant Last If You Have a Leak?
There’s no one true answer because it depends entirely on the size and location of the leak.
A very small leak may cause refrigerant to escape gradually, while a larger leak can affect the system much more quickly.
If you know your AC has a refrigerant leak, don’t rely on a specific timeline for how long a recharge will last. Have the leak evaluated so you understand what you’re dealing with.
Can You Smell an AC Refrigerant Leak?
Depending on the refrigerant and circumstances, you may not notice an obvious odor at all.
Cooling problems, ice formation, unusual sounds, and professional testing are much more useful for identifying a possible leak.
Is an AC Refrigerant Leak Dangerous?
Refrigerants should be handled by certified HVAC professionals.
A small leak within an HVAC system isn’t necessarily an immediate emergency, but refrigerant can pose health and safety risks at high concentrations, and direct contact with liquid refrigerant can cause cold burns or frostbite.
If you suspect a significant refrigerant release, avoid handling the equipment or trying to repair the leak yourself and contact an HVAC professional.
Will an AC Still Cool If It’s Low on Refrigerant?
It can.
An AC that’s somewhat low on refrigerant may continue producing cool air, but its cooling capacity and performance can suffer. As the refrigerant level becomes more problematic, you may notice longer runtimes, warmer air, difficulty reaching the thermostat setting, or ice formation.
Can Low Refrigerant Damage an AC?
Operating an AC with an improper refrigerant charge can put additional stress on the system and may contribute to more serious problems.
In particular, refrigerant plays a role in the conditions under which the compressor operates. Continuing to run a system with a significant refrigerant problem can potentially contribute to compressor damage, which is one of the more expensive AC repairs.
Can a Refrigerant Leak Be Repaired?
Often, yes.
The bigger question is whether the specific leak can be repaired economically. An accessible leak in a refrigerant line or connection may be relatively straightforward, while a leaking evaporator or condenser coil could require replacing a major component.
The age and overall condition of the AC should also factor into the decision.
How Much Does It Cost to Repair an AC Refrigerant Leak?
The cost can vary depending on where the leak is located and what needs to be repaired.
A relatively accessible connection or refrigerant line repair may cost much less than replacing an evaporator or condenser coil. Your total cost may also include leak detection, labor, refrigerant recovery, replacement parts, and recharging the system after the repair.
If you want to understand how refrigerant type, quantity, and other factors affect the price of recharging your system, check out this article that outlines the average cost to recharge an AC system and what factors affect that price!
