No, you should never mix R-422B and R-407C. Doing so causes severe pressure, temperature, and lubrication issues, and is prohibited by EPA guidelines.
Conclusion. Mixing R407C with R22 is not advisable due to chemical, lubricant, and performance incompatibilities. Retrofitting R22 systems to use R407C requires professional handling. Always follow manufacturer guidelines and regulations for refrigerant use.
No. There is no such thing as a “drop in” replacement for R-22. Mixing refrigerants is not recommended.
While R-407C is the closest match to R-22 in terms of pressures and cooling capacity, it is not a true "drop-in" replacement. You cannot simply pour it into an existing R-22 system without professional modifications and a full evacuation.
✔ Charge the refrigerant as a liquid (not vapor) to ensure proper blend ratios. ✔ Avoid mixing with other refrigerants. ✔ R-422B is non-toxic and non-flammable, but misuse can still cause harm. ✔ Follow EPA Section 608 guidelines for recovery and disposal.
Yes, R-422B is fully compatible with mineral oil. It contains a hydrocarbon component that thins the mineral oil and ensures it circulates properly back to the compressor. This makes it a popular drop-in replacement for R-22 systems, as it eliminates the need for expensive and time-consuming oil changes.
To avoid fractionation, R-407C should be removed from the cylinder as a liquid, and charged into the suction line during equipment operation. This can be done with a liquid charging adapter, which causes the liquid refrigerant to flash to a vapor prior to entering the system.
Freon™ 407C will have higher discharge pressures and lower discharge temperatures when compared to R-22 operation.
Yes, R-407C is being phased out. Under the US EPA AIM Act, production and use of high-Global Warming Potential (GWP) refrigerants, including R-407C, are strictly restricted.
A 30-pound cylinder of R-22 refrigerant is generally worth between $500 and $1,200 to purchase wholesale, and up to $2,400 to $4,500 if bought directly from a service company during a home repair.
Yes, R-422B (often sold as NU-22B) is a "near" drop-in replacement for R-22 in most residential and commercial air conditioning and refrigeration systems. It is designed to safely mimic R-22 operating pressures without requiring an expensive, time-consuming compressor oil change.
A2L refrigerants, the new refrigerants for 2026, will replace R-410A in new systems. A lot about A2L refrigerants is explained in their name: The “A” means low toxicity. The “2L” is a safety classification, indicating it is mildly flammable.
R-422B (often branded as NU-22B) is itself a popular, non-ozone-depleting HFC "drop-in" retrofit replacement for R-22 in air conditioning and refrigeration systems. It is compatible with mineral oil and does not typically require an oil change, making it a cost-effective alternative to R-22.
Because R-407C itself is widely used as a replacement for R-22, you are usually looking to replace R-407C when servicing or retrofitting existing systems. The most common modern alternatives include HFO blends like Opteon XP20 (R-449C) or R-427A, which offer similar thermodynamic properties, but their viability depends on your specific system components.
Putting too much PAG oil in an A/C compressor leads to a phenomenon called oil overcharge, which compromises both cooling performance and hardware integrity. An excess of oil coats the inside of A/C lines, displacing refrigerant and creating a variety of system-level issues.
The general observed trend was a drop in both capacity and efficiency and also in suction and discharge pressures. It was due to a loss ofR32 which is the highest pressure component in the mixture. Flammability issue may have to be considered for vapor leaks due to the higher percentage of R32 in the leaking vapor.
No, you cannot put R407C on top of an existing R22 charge.
Meaning the phase out of R22 has been planned for almost 30 years. So in summary, it's true, the EPA has mandated that no new “virgin” “HCFC 22” can be manufactured or imported after 2020 due to its effect on the environment.
You need at least Type II or Universal certification to buy or handle most HVAC refrigerants such as R410A, R407C, R22, etc.
For a standard R-407C air conditioning system running at an 𝟖𝟓∘𝑭 (𝟐𝟗∘𝑪) ambient temperature, a healthy operating range is 𝟕𝟎 𝐩𝐬𝐢 to 𝟖𝟓 𝐩𝐬𝐢 on the low (suction) side and 𝟐𝟐𝟎 𝐩𝐬𝐢 to 𝟐𝟔𝟎 𝐩𝐬𝐢 on the high (discharge) side.
As of January 1, 2020, the United States banned the use of the R22 refrigerant, commonly known as Freon.
R22 systems traditionally use mineral oil, while many replacement refrigerants like R407C require POE oil. If you blend R22 with a refrigerant demanding POE oil: The mineral oil won't mix correctly with the new refrigerant. Lubrication fails inside the compressor.
No, R-407C is not compatible with mineral oil.
The Mastercool 54350 Low-Side Pressure/Temperature Analog Gauge is a high-quality replacement gauge that includes an anti-flutter feature which reduces needle fluctuation and increases reading accuracy. This gauge is for use with R-134a, R-404A, R-407C, and R-507A refrigeration systems. Diameter: 3-1/8 in.
The 3-minute rule is a simple but important guideline: wait at least three minutes after turning your air conditioner off before turning it back on. That short pause gives the refrigerant pressure in the system time to equalize.