How long does Freon last in a central air conditioner?

Author: Abbigail Hahn  |  Last update: Friday, December 5, 2025

1 How Long Does Refrigerant Last? In most cases, refrigerant in a central air conditioning should last for the life of the system. As long as your HVAC system is kept in good working order, you should never have to worry about replenishing it.

How often do you need to add Freon to a central air conditioning unit?

Most systems need Freon replacement anywhere from once every two to five years from a professional HVAC Contractor. The most significant exception to this rule is when there is a leak in the air conditioning system, which decreases the amount of refrigerant in an AC unit over time.

Can an AC unit lose Freon without a leak?

No. Freon is a VERY stable molecule and won't break down over time. The only way it can escape from a cooling system is via a leak of some sort.

How much does it cost to replace Freon in an AC unit?

Most homeowners will pay in the range of $200 to $400 for a refill, depending on the type and size of their HVAC unit. If you own a larger r22 unit, you may have to spend $600 or more. To break this down for you, a 25lbs unit of r410A costs anything between $100 and $175.

How long should Freon last in central air?

Generally speaking, a properly maintained air conditioner can expect its refrigerant to last around 10-15 years or longer—depending on usage frequency and environmental wear and tear. To ensure your refrigerant lasts as long as possible, regular maintenance is key.

How Long Should My Air Conditioning System Last?

How to tell if an AC unit is low on Freon?

Signs your AC is Low on Freon
  1. It Takes Much Longer Than It Should to Cool Off Your Home.
  2. Your Utility Bills Are Higher Than Usual.
  3. The Air Coming Out of Your Vents Isn't Cold.
  4. Ice Has Started to Build Up on Your Refrigerant Line.
  5. You Hear Loud or Unusual Noises Coming From Your Unit.
  6. Hissing or Bubbling Noise.

Is it normal for AC to lose Freon over time?

Yes. Age eventually takes its toll on an air conditioner, so you could say a refrigerant leak is inevitable.

How do I know if my AC unit needs Freon?

How To Know If AC Is Out of Freon
  1. AC is running, but the home isn't cool. You might feel warm air flowing through the vents, or you might notice that your AC is weaker than it used to be. ...
  2. Ice buildup on refrigerant line. ...
  3. Higher electricity bills. ...
  4. Hissing or bubbling sound from the refrigerant line.

Why is HVAC Freon so expensive?

A Question of Supply and Demand

Even though Freon is still being produced, the supply has dwindled as producers have cut back in anticipation of lower demand. Therefore, maintenance people and air conditioning system specialists have less supply and are charging more for it.

Can I recharge my central air unit myself?

Under EPA regulations, only a certified professional can recharge your home's HVAC system. You should never try to recharge the A/C yourself, even if you have a home air conditioner recharging kit. The refrigerant used can be harmful to you and the environment if it's not handled properly.

Does low freon always mean a leak?

It's important to note that low refrigerant levels don't always mean a leak. We often receive calls at Watkins Heating & Cooling from customers with low Freon who had their HVAC system installed by other companies.

Can you stay in a house with a freon leak?

Can you stay in a house with a Freon leak? While a small leak in your AC unit may not pose an immediate danger, it's essential to address the issue promptly. Leaking refrigerant can lead to inefficient cooling and higher utility bills, and prolonged exposure might cause health issues.

Can a freon leak in central air be fixed?

An AC Freon leak may sound like a severe problem, but these leaks can be fixed if they are caught early.

Is it illegal to add Freon to a leaking air conditioner?

So, what happens if you do just add refrigerant to a leaking AC system, or don't get it fixed once the leak is reported? The EPA will fine you. There is no way to sugarcoat this. The fine can be as high as $37,500 per day.

Will AutoZone recharge my AC?

An AC leak will lead to warmer air from your vents over time. In most cases this can be fixed with a proven stop leak additive to seal up any leaks. When it's time for an AC recharge, turn to AutoZone.

Can you put new Freon in an old AC unit?

If you put the newer freon in right away, your unit will rupture due to the force. However, you can convert your AC unit to handle R410A. You'll need to replace the compressor, condenser, evaporator, and likely the refrigerant tubing. If you replace all of this, your old unit will work fine with the new freon.

How many years does Freon last in a air conditioner?

Theoretically, Freon can last forever. It is not burned up like fuel. When an air conditioning system is in top shape, the refrigerant will be continually recycled within a closed system, to cool your home.

Why is Freon being banned?

Why Did The U.S Ban R22 Refrigerant? The U.S. Environmental Protection Agency (EPA) has banned R22 freon in the country. Why? R22 contributes to the depletion of the ozone layer – which absorbs the ultraviolet radiation from the sun and protects us from its harmful effects – and the ecosystem in general.

Do they still sell Freon for air conditioners?

The recent phase-out of R-22 (also known by its popular brand name: Freon®) that occurred January 1, 2020 was years in the making. While we still service HVAC equipment using Freon, most residential HVAC units are now using Puron® or R-410A, a type of hydrocarbon refrigerant without the chlorine.

Is it OK to run AC low on Freon?

Too little refrigerant also risks freezing the evaporator coil inside your home. The first problem with a frozen coil is the airflow restriction it causes, preventing air from circulating back out. The second problem is the water it creates once the ice melts, risking further damage around your AC.

How long should a central air system last?

While every unit is different, and every homeowner has a different understanding of when their central air conditioner is broken beyond repair, it's fair to say that, with proper maintenance and care, you can expect a good 15 to 20 years of cooling from a new high efficiency air conditioning system.

Is it possible to lose Freon without a leak?

While the refrigerant in your vehicle can escape even without a leak, it's often not enough to cause significant issues unless you've failed to top up the refrigerant for years. When the lack of refrigerant becomes significant though, it can cause a number of problems, including an overheating driver in the summer sun.

How often should AC Freon be replaced?

In fact, most units only need to be recharged once every two to five years – and sometimes even longer than that. The main exception to this rule is if there's a leak in the system, which will cause the refrigerant level to drop over time.

Where are most refrigerant leaks?

3 Frequent Air Conditioning Refrigerant Leak Sites
  1. Capillary Tube. The capillary tube is the simplest example of a throttling device. ...
  2. Flare Fittings. Flare fittings can be found anywhere a capillary tube or other section of metal tubing attaches to an air conditioning component. ...
  3. Evaporator Coil.

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