Can you mix R-22 with another refrigerant?

Author: Rachael Bogisich  |  Last update: Friday, June 27, 2025

With the R22 phase out in 2020 due to its environmental impact, this is a common question for those looking to upgrade their system or change the refrigerant in their system. The answer is no, refrigerants should not be mixed.

What refrigerant can I mix with R-22?

Rs44b can be mixed with r22.

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

R-22 systems are typically about 300 psi maximum. If you add R-22 to an R-134a system, you will not get close to the rated cooling capacity of the A/C system. In conclusion, do not mix R-22 with R-134a refrigerants, you will ruin the charge, and possibly seriously damage or destroy your A/C system.

Can I mix R-22 and R-410A?

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.

Can you mix R-22 and 404a?

No ,R404A works at higher pressure and is much better in absorbing and releasing heat .

The Truth About The New R32 VS R410A Heat Pump Air Conditioner (4k)

What happens if you mix R22 and 407C?

If your system is running on R22 most likely is using mineral oil to lubricate the compressor. If you mix R407C with R22 inside your system the molecule of the HFC (R407C) gas will not link with the oil and in just few months of operation you will have a "sludge" like lubricant formation inside the circuit.

Which refrigerants can be mixed?

You're wondering if you can mix different refrigerants for your air conditioning system. The short-long-only answer is no, never. There are many reasons why it's impractical, illegal, and not economical for a homeowner to mix refrigerant types.

Is it legal to mix refrigerants?

Some contractors mix refrigerants because they're trying to save money. By mixing different types of refrigerants, they can use a cheaper refrigerant to top off your system. This is not only illegal, but it's also bad for your system and the environment.

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.

How much higher is the pressure of R-410A than R-22?

Tube-side materials in R-410A coils need to be thicker due to the higher operating pressures associated with R-410A relative to R-22. We're not arguing that there's not a difference in operating pressure between the two. There is – roughly 130 PSI for R-410A evaporators compared to about 70 for R-22.

Can you top off R-22 with MO99?

Yes. Freon™ MO99 can be used to retrofit R-22 heat pumps . Based on system testing, similar efficiency and slightly lower capacity can be expected. A slightly lower capacity may force the compressor run time to increase.

Is it illegal to recharge AC with R-22?

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.

Can you use the same line set from R-22 to 410A?

To retrofit an R-22 system with R-410A system your line set must not be more than 25-50 feet in total distance. If the line set is longer than this, you will have to replace the line set with larger lines.

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.

What is the drop in replacement for R-22?

RS-44 is a “Drop-in” replacement for R22 providing an easy and at the same time a long term solution. Because there is no need to use expensive and hygroscopic synthetic lubricants, the risk of moisture ingress into a refrigeration system is completely avoided.

What would happen if R-410A was added to an R-22 system?

A NJ Tech Explains. The answer: No. Putting R-410A refrigerant into an AC unit that was designed to use R-22 will cause the unit to die soon after it tries to run.

Can I mix R-410A with R-22?

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 R-454B be retrofitted into existing R-410A or R-22 systems?

ACHR NEWS: As a mildly flammable refrigerant, R-454B can't be retrofitted into existing R-22 and R-410A systems.

Will R-410A be phased out?

The impending phaseout of R-410A, a widely used refrigerant in HVAC systems, marks a huge shift for homeowners and the HVAC industry. Set to take effect on December 31, 2024, this change is driven by global efforts to reduce greenhouse gas emissions and comply with environmental regulations.

What freon can be mixed with R-22?

So… what refrigerant can be mixed with R-22? None. You can't mix refrigerants.

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.

Can you put 407C in a R-22 unit?

Using these retrofit guidelines, many R-22 systems can be retrofitted for use with Freon™ 407C in air conditioning, heat pump applications, and refrigeration applications to allow existing equipment to continue to operate safely and efficiently, even after R-22 is no longer available.

Are R410A and R-22 refrigerants interchangeable and compatible with each other?

The refrigerants have very different heat-transfer properties and use chemically incompatible lubricating oils, so they aren't interchangeable and can't be mixed. Transitioning one unit to the next could require replacing the compressor, evaporator and condenser, along with potentially replacing their copper lines.

Will 134a mix with R-22?

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.

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.

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