Is it illegal to mix refrigerants?

Author: Leatha Oberbrunner  |  Last update: Saturday, March 7, 2026

It is not only uneconomical and impractical to mix different types of refrigerants, but it can also be dangerous. Along with that, it is illegal to mix refrigerants. So, not only does it make sense to use the right kind of refrigerant for your system, but it's also the law.

What happens if you mix refrigerants?

If you were to mix refrigerants, it would cause all kinds of damage to your system. Your AC unit would likely overheat. Different refrigerants can be different temperatures. They don't mix, which means you'll have refrigerants with two different temperatures running through your unit.

Can R22 and R410A be mixed?

No, you cannot. To make a short story long, R410A and R22 are refrigerants. They are both good refrigerants and they both work, but they have to be charged in the system at different pressures. R410A is a higher pressure system and R22 is a lower pressure system.

Is it true that shops can mix refrigerants?

Unlike many HVAC-related questions, the answer to this is an unequivocal no. This is true even if a product is advertised as mixable or even if a technician tells you it's OK to mix! Different refrigerants use different oils to lubricate the system, and these oils don't mix.

Can you mix R22 and 407C refrigerant?

Mixing R22 with R407C or any other refrigerant. According to the 609 EPA rule, mixing refrigerants is illegal and anybody caught doing so will be heavily fined.

Dangers of Mixing R22 with Other Refrigerants: What Happens in Refrigeration & AC Systems?

What happens if you mix R-22 with another refrigerant?

At the very least, leaks will occur. Mixing refrigerants is not an option either. This will contaminate the system, and the R22 will not evaporate under the higher suction pressure that R410A requires.

Does 407C run higher pressure than R-22?

Heating mode The compressor pressure ratio of R-407C was 0.7% to 9.3% higher than R-22 for the two heating mode test conditions.

Can you mix R22 and R134a together?

No, the compressor will fail. These two refrigerants have very different properties. One of R22 and R134a is high pressure and the other is low pressure. They don't mix chemically and don't have the same boiling point, leading to inefficiencies and eventual compressor failure.

Is it legal to add R22 refrigerant?

As of January 1, 2020, production and import of R22 refrigerant will be illegal in the United States. Of course, continued use of your air conditioner (AC) or heat pump system using R22 refrigerant is allowed.

What refrigerant is now illegal?

R-22 (Chlorodifluoromethane), also known as R22 Freon or HCFC-22 Freon, was a common refrigerant for HVAC systems. It is now a banned refrigerant that is illegal to import or manufacture.

How much does it cost to convert R-22 to R-410A?

How much will an R-22 to R-410A conversion cost? The actual cost will depend on many things, including where you live, but most of the time R-22 conversions start at around $2,000 and go up from there. The higher end of that range is somewhere around $4,500 to $4,600.

Can R134a be used instead of R-410A?

An environmentally more benign refrigerant for replacing refrigerant R410A includes a majority portion of refrigerant R32 and a minority portion of refrigerant R134a, the volumetric capacity of the replacement refrigerant permitting it to be used as a near or exact drop-in replacement for refrigerant R410A in terms of ...

Can you mix R-22 and new 22?

Mixing refrigerants is not recommended. R-22 replacements should not be used to top off R-22 systems. R-22 should be recovered using appropriate equipment and managed according to U.S. EPA guidelines specified in Section 608 of the U.S. Clean Air Act.

Can R-22 and 410A be mixed?

As you might imagine, this isn't going to go well for your air conditioner or heat pump. Long story short? Never mix R-22 and R-410a. Unless of course you are looking to destroy your HVAC system, then, by all means, go live that dream.

Can you mix brands of AC refrigerant?

In short, the answer is, "No!" Automotive refrigerants are volatile compounds that can have a negative effect on the environment. Combining them can have adverse effects, and cause damage to your car's A/C system.

Can you flush R-22 to R410A?

When you replace an air conditioner or heat pump and upgrade from R-22 to R-410A, the ideal solution is to replace your refrigerant lines. This is because the mineral oil used in R-22 systems is not compatible with the new R-410A refrigerant and oil.

When was R22 banned?

R-22 is a refrigerant that is often used in air- conditioning equipment. Because R-22 depletes the ozone layer, production and import was further limited in 2010. In 2020, R-22 will no longer be produced or imported. After 2020, only recovered, recycled, or reclaimed supplies of R-22 will be available.

What is the new refrigerant for 2025?

What refrigerant will replace R-410A in 2025? For whole-home systems, Lennox has chosen 2025 Compliant Refrigerant R-454B due to its excellent performance for ducted systems and zero ozone depletion potential. For mini-splits, we selected R-32, designed to optimize efficiency and reliability in ductless systems.

How many pounds of R22 are in a 3 ton unit?

Size of the HVAC Unit

Since an air conditioner uses an average of 2 to 4 pounds of refrigerant per ton, a 3-ton AC will need an average of 9 pounds. With the cost of R-22 refrigerant increasing each year, it can cost a pretty penny to recharge larger systems that still use the refrigerant.

What happens if you mix R-22 with another refrigerant?

Mixed refrigerants can cause increased system pressures and temperatures changing them for the worse. This can result in ineffective compressor cooling and possible compressor damage, ineffective cooling, and metering device malfunction. Different types of refrigerants are not meant to be mixed.

Is it illegal to recharge AC with R-22?

R22 phaseout in 2020 means that it's completely illegal to manufacture or import R22 into the country. Recovered, recycled, or reclaimed R22 can still service existing HVAC systems, but chemical manufacturers can't produce new R22 refrigerants to service existing air conditioners and heat pumps.

What are the consequences of mixing refrigerants?

Mixing ODS and non-ODS refrigerants can result in chemical reactions that produce harmful byproducts or increase the risk of leaks. These byproducts can be toxic, corrosive, or flammable, posing a danger to occupants and technicians working with the system.

Can I use 407C instead of 134a?

Another reason why R134a is the choice refrigerant for high ambient is that in air-conditioning systems that are similarly optimised to deliver the same cooling capacity, an R407C system shall lose more cooling capacity than an R134a when the ambient temperature increases beyond the design point.

Is MO99 a direct replacement for R-22?

Yes. The mass flow rate and operating pressures of Freon™ MO99 are the closest of all the mineral oil compatible replacement products and will likely perform adequately in an existing R-22 system with a capillary tube expansion device.

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