Air Conditioning Refrigerant: Types, Costs, and What Every Australian Homeowner Should Know

What Is Air Conditioning Refrigerant and How Does It Work?

Air conditioning refrigerant is the chemical compound that makes your air conditioner actually work. Without it, your system is just a fan. Refrigerant circulates continuously through the copper coils inside your unit, absorbing heat from the air inside your home and carrying it outside, leaving your rooms cooler. It is the invisible workhorse behind every degree of comfort your system delivers.

The process follows four basic stages. First, the refrigerant enters the indoor evaporator coil as a cold, low-pressure liquid and absorbs heat from the indoor air, causing it to evaporate into a gas. The compressor then pressurises that gas, raising its temperature significantly. Next, the hot gas moves to the outdoor condenser coil, where it releases that heat into the outside air and returns to a liquid state. Finally, an expansion valve drops the pressure again, cooling the liquid down before the cycle repeats.

One thing worth understanding early: refrigerant is not consumed like fuel. Under normal operating conditions, the level in your system should stay constant for the entire life of the unit. If a technician tells you your refrigerant is low, that almost always means there is a leak somewhere in the system. Topping it up without finding and fixing the leak is a short-term fix that will leave you back in the same position within months.

The Main Types of Air Conditioning Refrigerant Used in Australia

Australia has been through several generations of refrigerant technology, and the type your system uses affects everything from servicing costs to environmental impact. The three refrigerants most Australian homeowners will encounter are R22, R410A and R32, each representing a different era of air conditioning. Here is how they compare at a glance.

R22: The Legacy Refrigerant

R22, often referred to by the brand name Freon, was the dominant refrigerant in Australian air conditioners for decades. It was effective and widely used, but it carries a significant ozone depletion potential, which led to its phase-out under the Montreal Protocol. Australia stopped allowing the import of R22 for new equipment years ago, and it has been fully phased out for new systems.

The problem for homeowners with older R22 systems is that the only supply available now is reclaimed or recycled R22, and that scarcity makes it expensive. A regas on an R22 system can cost considerably more than the same job on a modern unit. If your system is old enough to run on R22, it is almost certainly past its prime in other ways too. The honest advice here is to start budgeting for a replacement rather than pouring money into ongoing repairs and costly regassing.

R410A: The Transitional Standard

R410A stepped in to replace R22 and became the dominant refrigerant in Australian split systems and ducted units from the late 1990s through to the early 2020s. It has zero ozone depletion potential, which solved the problem that made R22 unacceptable. However, its global warming potential of 2,088 is very high, meaning a leak releases a gas that is over 2,000 times more potent than carbon dioxide as a greenhouse gas.

Australia began phasing out R410A in new equipment from 2025 as part of broader HFC reduction commitments. If your current system uses R410A, there is no need to panic. Existing systems will continue to be serviced and R410A will remain available for that purpose for years to come. What is changing is that manufacturers are no longer producing new equipment designed around R410A, so if you are buying a new unit today, it will almost certainly use R32 instead.

R32: The Current Standard for New Systems

R32 is now the refrigerant of choice for new residential split system air conditioners sold in Australia. Its global warming potential of 675 is roughly one-third that of R410A, making it a meaningfully better outcome for the environment if a leak does occur. It also performs efficiently at the pressures used in modern inverter systems, which contributes to the strong energy ratings you see on current models.

Every major brand selling new residential split systems in Australia has moved to R32. Daikin, Mitsubishi Electric, Fujitsu and others all use it across their current lineups. The one consideration worth knowing about is that R32 carries an A2L classification, meaning it is mildly flammable. This sounds more alarming than it is in practice. Licensed refrigeration technicians are trained to handle A2L refrigerants as standard, and the risk in a correctly installed and serviced home system is negligible. It does mean that R32 work must be done by a licensed technician, but that was always the legal requirement for refrigerant handling in Australia regardless of the type involved.

Refrigerant Costs in Australia: Regas, Leak Repairs, and What to Budget

A refrigerant regas in Australia typically costs between $150 and $400, depending on the type of refrigerant your system uses and how much needs to be added. R32 and R410A regasses sit toward the lower end of that range, while an R22 regas can push well beyond $400 due to the scarcity of reclaimed supply. For a full breakdown of what drives those numbers, see our guide to aircon regas costs and what to expect.

Before any refrigerant is added, a technician should locate the source of the leak. Leak detection typically costs between $100 and $300, and that is before any repair labour. The repair itself varies depending on where the leak is and how accessible the affected component is. For broader context on what a service call involves, our guide to air conditioner service prices in Australia covers the full picture.

The most important thing to understand is this: a regas without fixing the underlying leak is a waste of money. Refrigerant does not disappear on its own. If your system is low, it is leaking, and topping it up without sealing the leak means you will be back in the same position within months. Any reputable technician will insist on finding and repairing the leak before adding refrigerant.

Only licensed refrigerant handling technicians can legally purchase and handle refrigerant in Australia. This is not a grey area. Technicians must hold an ARCtick licence issued by the Australian Refrigeration Council, and it is illegal for unlicensed individuals to buy or handle refrigerant regardless of the type. If someone offers to regas your system without verifiable credentials, walk away.

If your system has needed regassing more than once in a few years, it is worth having an honest conversation with your technician about replacement. Repeated regassing costs add up quickly, and an older system that keeps losing refrigerant is likely costing you more in energy bills too. At some point, a new unit is the more cost-effective path.

Signs Your Air Conditioner May Have a Refrigerant Leak

A refrigerant leak does not always announce itself dramatically. The most common signs are gradual changes in how your system performs, and many homeowners put them down to the unit just "getting old" before a technician identifies the real cause. Knowing what to look for can save you months of discomfort and a higher electricity bill.

The five most common warning signs of low refrigerant are:

• Weak or warm airflow. The system runs and blows air, but the air is not as cold as it used to be. The unit may run for long periods without the room reaching the set temperature.
• Ice forming on the unit or lines. Ice on the indoor evaporator coil or on the copper refrigerant lines running to the outdoor unit is a classic sign of low refrigerant. It sounds counterintuitive, but insufficient refrigerant causes the coil to get too cold and freeze the moisture around it.
• Hissing or bubbling sounds. A hissing noise near the indoor or outdoor unit can indicate refrigerant escaping through a crack or loose fitting. A bubbling sound may suggest refrigerant mixing with air or moisture inside the lines.
• Higher electricity bills without obvious cause. A system low on refrigerant has to work much harder to achieve the same cooling effect. If your bills have crept up but your usage habits have not changed, the system's efficiency may have dropped due to a refrigerant issue.
• Much longer cooling times. If a room that used to cool down in 15 minutes now takes 45, the system is struggling. Low refrigerant is one of the more common reasons for this.

These symptoms do not automatically confirm a refrigerant leak. A clogged filter, a dirty evaporator coil or a failing compressor can produce very similar results. That is exactly why a licensed technician needs to diagnose the problem properly rather than assuming a regas will fix it.

Never attempt to handle refrigerant yourself. Beyond the legal issue of requiring an ARCtick licence, refrigerant under pressure can cause serious injury, and mishandling it can damage your system beyond repair. If you recognise any of the signs above, book a service call and let a qualified technician take it from there.

Buying a New Air Conditioner? Choose a System Built for R32

All new residential split systems sold in Australia now use R32 refrigerant, so if you are shopping for a replacement today, you do not need to worry about which refrigerant to choose. The decision has already been made for you by the industry. What matters is recognising when upgrading makes more financial sense than continuing to service an older unit.

If your system is old enough to use R22, the maths rarely favour keeping it. Reclaimed R22 is expensive, the unit itself is likely well past its efficiency peak, and repair costs tend to compound. Even an early R410A system that has needed regassing more than once in recent years deserves a hard look. A modern R32 inverter system will almost always run more efficiently, cost less to service and carry a fresh warranty.

Daikin, Mitsubishi Electric and Fujitsu have all fully transitioned their residential ranges to R32. To give you a sense of what current entry-level R32 systems cost, here are three examples available at AusAir Conditioners right now:

• Daikin Cora 2kW (FTXV20WVMA) from $982. A reliable entry-level inverter split system from one of Australia's most trusted brands.
• Mitsubishi Electric AP Series 2kW (MSZ-AP20VGD) from $1,016. A compact, quiet unit well suited to bedrooms and smaller living spaces.
• Fujitsu Lifestyle 2.5kW (ASTG09KMTC) from $1,014. A step up in capacity with a slim indoor unit profile that suits tighter wall spaces.

All three use R32, carry strong energy ratings and are backed by manufacturer warranties. If you are ready to move on from an ageing system, browse our range of split system air conditioners to compare models, capacities and prices across all the major brands.

Frequently Asked Questions About Air Conditioning Refrigerant

What refrigerant is used in air conditioners?

Most new residential air conditioners in Australia use R32 refrigerant. Older systems installed before roughly 2015 may use R410A, and systems more than 15 to 20 years old may still use R22. The exact refrigerant type used in your unit is printed on the outdoor unit's data plate, usually under a label marked 'Refrigerant' or 'Ref.'

Is R-134a refrigerant banned in Australia?

R-134a is not banned in Australia, but it is not used in standard residential air conditioners. It is primarily found in automotive air conditioning systems and some commercial refrigeration equipment. Australian residential split systems use R32 in new units and R410A in older ones. If someone suggests your home split system uses R-134a, that is worth querying with a second opinion.

Can I just add refrigerant to my AC?

No. In Australia, only licensed technicians holding an ARCtick refrigerant handling licence issued by the Australian Refrigeration Council can legally purchase and handle refrigerants. Beyond the legal requirement, simply topping up refrigerant without finding and fixing the underlying leak is a short-term fix. The refrigerant will escape again through the same leak, and you will be back in the same position within months.

How do I know if my AC is R410A or R-22?

Check the data plate on the outdoor unit. It will list the refrigerant type under a label such as 'Refrigerant' or 'Ref.' As a rough guide, systems installed before 2010 are more likely to use R22, while systems installed between roughly 2010 and 2022 typically use R410A. If the label is worn or missing, a licensed technician can identify the refrigerant type during a routine service call.