Are your AC units working fine through the day but the cooling is not being done? Do you hear an unusual hissing sound from your indoor unit? Then there may be a problem with a refrigerant leak.
Air conditioner refrigerant leak repair (also known as Freon) is a fluid used for the absorption of heat from inside your house and its expulsion into the outside environment. With a refrigerant leak, your air conditioner will have trouble cooling, high energy consumption and even damage to the compressor.
In this article, we’ll discuss how to identify the problem, repair costs, detection of leaks, as well as repairs and replacements.
What Is an Air Conditioner Refrigerant Leak?
AC Refrigerant Leak is the escape of the refrigerant chemical from the sealed copper tubing of your air conditioning unit.
There exists an idea among most people that air conditioning consumes refrigerant just as cars consume gasoline. This is not true because your air conditioner is a closed system where the refrigerant keeps circulating to cool the air; it should never reduce or be depleted unless there is a leak.
Why Does AC Refrigerant Leak Happen?
The leakage of refrigerant gas occurs as a consequence of physical deterioration. This happens due to the following reasons:
- Corrosion: Copper pipes begin corroding due to moisture and chemicals contained in the air, thus forming tiny holes referred to as pinhole leakages.
- Factory Defects: Improper factory processes and poor soldering result in cracks after some time.
- Vibration and Deterioration: Due to vibration of the compressor, connections start to loosen up.
- Formaldehyde Pollution: The formic acid formed due to the mixing of household pollutants and moisture causes small holes in indoor copper pipes.
What Are the 7 Signs of an Air Conditioner Refrigerant Leak?
There will be clear warning signs of a leak in your system. These are the 7 signs you should pay attention to:
AC Blows Warm Air:
The first indication of leakage is warm or room temperature air being blown out of the supply vent system. The primary role of the refrigerant is to absorb the heat in the indoor air and reject it into the outside air. In case the amount of the refrigerant drops below the normal levels, the heat absorption capability is compromised, and hence warm air is produced.
AC Works Non-stop:
Are you aware of how your air conditioner is working non-stop without switching off at all? As there is leakage of refrigerant, the ability of your air conditioner to cool down is compromised, and therefore, in order to achieve the desired temperature that you have set in the thermostat, your air conditioner works non-stop.
High Electric Bills:
An unexpected increase in your monthly power bill is usually caused by the invisible refrigerant leaking from your unit. Since your AC system needs to work harder to make your house cool, it uses much more electricity than normally. So, even though nothing unusual about the way you use power happened, the leak can cause such an increase.
Hissing/Bubbling Sounds:
There is high pressure in the refrigerant lines for the air conditioner, which causes such leaks to produce unique sounds. The hissing sound suggests that there is a leak of the refrigerant gas through the small pinhole with pressure. The bubbling sound implies that there is a leak in the liquid line.
Frozen Coils:
This may seem odd, but insufficient refrigerant is actually what leads to the indoor evaporator coil freezing up. Without adequate refrigerant flowing through the coil to capture heat from indoors, the refrigerant becomes so cold that it freezes, trapping moisture in the form of ice against the metal.
High Humidity Indoors:
Not only does an air conditioner keep your house cool, but it is also responsible for dehumidifying the indoor air since it removes the humidity when operating. In the case of a refrigerant leak which leads to inefficient cooling, the process of dehumidification will not be performed properly anymore.
Water Around Your Indoor Unit:
The formation of water pools in the area near your indoor furnace or air handler is due to ice melting. Once you turn off your system, the ice formed in your evaporator coils will melt very quickly, causing an overflow of the melted ice water in your drain pan.
How to Detect an AC Refrigerant Leak?
Specialized techniques can be employed by HVAC experts to detect leaks:
- Electronic Leak Detector (Sniffer): This is a handheld tool used to detect chemical gases around the coils.
- Bubble Test: Here, a soap solution is applied to the copper coils, and whenever there is a leak, bubbles will immediately appear.
- UV Dye Test: Fluorescent dye is introduced into the refrigerant lines. Technicians then identify the precise area where the dye appears using UV lights.
- Nitrogen Pressure Test: This test involves the evacuation of the unit followed by introducing highly pressurized nitrogen gas into the system.
Step by Step Air Conditioner Refrigerant Leak Repair Process
Repairing a refrigerant leakage is a job that requires expertise and can only be done by skilled HVAC technicians. Refrigerants are under pressure and are also harmful to the environment.
The following is the procedure involved in the repairing of the leaking refrigerant:
Step 1: Locating the Leak
Before any repair can begin, the technician must pinpoint the exact location of the leak. HVAC professionals use precise diagnostic methods rather than guessing:
Electronic Leak Detectors (Sniffers): These highly sensitive instruments help detect minute quantities of fumes from refrigerants in the air around the coils and joints.
Bubble Test: The pipe is treated with a special soap solution. When there is any leakage, bubbles begin to appear.
Dye Test with UV Light: A fluorescent dye is added to the refrigerant system. With the help of an ultraviolet lamp, the leaking point can be found by seeing the fluorescent dye leak out.
Step 2: Recovering Remaining Refrigerant
Release of refrigerant gas should not be to the environment based on the laws of the land regarding environmental protection. The technician will connect a specific machine that will help recover the refrigerant and place it into a certified container by the EPA before making any cut or soldering on the copper pipe.
Step 3: Repair or Replacement of the Defective Part
Having drained the refrigerant and depressurized the equipment, the technician fixes the damaged part:
Small Leaks: In case there are small leaks in accessible copper pipes, the plumber uses high temperature brazing (welding technique using copper alloyed rods).
Large Leaks or Old/Corroded Coils: In cases where the evaporator or condenser coil is old or corroded or full of many tiny holes, repair work will not be sufficient. The technician will then replace the old one with a new one.
Step 4: Nitrogen Vacuum & Leak Testing
Following the physical repairs, the entire unit will need to undergo testing and preparation prior to adding any additional refrigerant:
Pressure Test: High pressure nitrogen gas is pumped through the lines in order to test whether the newly made weld is effective without any leaks.
Deep Vacuuming: The mechanic attaches the vacuum pump and removes all the moisture, air, and other non-condensable gasses from the copper pipe. Moisture inside the AC system can form acid when mixed with oil.
Step 5: Recharging the System
Finally, it is time to recharge the system with the new refrigerant. The correct amount of refrigerant (R-410A, for example) prescribed by the manufacturer is weighed correctly using the electronic scales. The right recharging of the air conditioning system will ensure the efficient operation of your air conditioner and energy savings.
How Much Does an Air Conditioner Refrigerant Leak Repair Cost?
It is highly dependent on which servicing company you choose, where you live, and what type of air conditioner you have.
The price is not constant but is influenced by various important considerations:
- The Service Agency and Labor Costs: The costs depend upon who the service agency is, the technician’s qualification, and the cost of labor in the particular area. Additional charges may be added for emergencies or peak summer season.
- Type of Repair Needed: A patch or flare joint repair would be much cheaper than the cost of replacing a significant part such as a corroded evaporator or condenser coil.
- Type of Refrigerant: Machines that use standard refrigerants will definitely be cheaper to refill than machines using outdated refrigerants such as the R-22 Freon because of the high cost of these refrigerants in the market.
- Size of System and Extent of Damage: Large air-conditioning systems will need more gas to be filled than small ones.
For an effective evaluation and honest quote without any hidden costs, it is advisable to approach accredited HVAC contractors such as Top Tech Mechanical. Top Tech Mechanical offers professional leak detection services, inspection and pricing options customized for your particular air conditioning unit.
Fix Or Replace: What to Do in This Situation?
Whether it is worth fixing or replacing the system will depend on the application of a simple rule of thumb known as the 50% Rule.
The 50% Rule states that when the cost of the repair is more than 50% of the total cost of a brand new AC unit or your AC unit is beyond 10 years old, then replacement may be better.
- When to Repair: Your AC is less than 8 years old, the problem is small, and the repair is inexpensive.
- When to Replace: Your system is older than 10 to 12 years, has outdated R-22 refrigerant, or experiences repeated leaks.
Can You Run an AC With a Refrigerant Leak?
Absolutely not, you must never use your air conditioner in the event that there is a refrigerant leak. Your air conditioning unit must be turned off immediately.
The problem with using your air conditioner when there is a leak is that your compressor (the most important and costly part of your air conditioner), needs refrigerant to cool not only your house, but its motor, and to circulate oil within itself.
What happens is that when there is a lack of refrigerant in your system, your compressor will be working extra hard to achieve your set thermostat temperature without the right lubrication or cooling effect. It will overheat and burn out. Replacement of a burned-out compressor is usually very expensive.
How to Prevent Air Conditioner Refrigerant Leaks?
Although some degree of wear and tear is expected, there are certain ways to increase the life of your machine:
- Schedule Annual Maintenance: This way, any micro-corrosion will be spotted by the specialists before any major leakage happens.
- Replace Air Filters: Clean air circulation will help prevent your coils from freezing and placing extra load on the copper pipes.
- Keep Two Feet Clear Around Your Outdoor Unit: Keep any dirt, vegetation, and other contaminants away from your outdoor unit.
Need Fast & Reliable AC Leak Repair?
A refrigerant leak will not mend itself and postponing it leads to high electricity costs and compressor damage. When your house is not cooling properly, give the skilled team of Top Tech Mechanical a call.
The team of experts from Top Tech Mechanical utilizes state-of-the-art electronic detection systems to detect the issue quickly and give upfront pricing for their work. Call Top Tech Mechanical today for your AC check-up!
Frequently Asked Questions
How do I know if my AC has a refrigerant leak?
Your AC blows hot air, runs continuously, produces hissing and bubbling noises, turns icy, or suddenly begins using more energy.
Is it worth fixing a refrigerant leak on an old AC unit?
No. It would be a waste of money to repair leaks in an older AC unit which has been working for more than ten years. In this case, it would be much better to buy a new one.
Can I add refrigerant to my AC myself without fixing the leak?
No, it is forbidden by law, dangerous and absolutely useless as the refrigerant will leak again as there will be no patch in the hole.
How long does AC refrigerant leak repair take?
It takes from two to four hours to repair the leak of refrigerant in an AC unit. If the major part of the system is leaking, it will take you a whole day.
Should You Repair or Replace Your AC After a Refrigerant Leak?
Repair: In case the AC is younger than 8 years and the cost of repair is lower than 50% of the cost of buying a new AC, go for repairs.
Replace: In case the AC is older than 10 years and the cost of repairing is higher than 50% of a new AC, replace it.
