R22 Replacement: R407C, R427A, R438A & Modern System Alternatives
R22 (HCFC-22) is an ozone-depleting refrigerant with a huge installed base in older air-conditioning, heat-pump and refrigeration equipment. In the United States, production and import of new HCFC-22 ended in 2020, but existing equipment can still be serviced with recovered, reclaimed or previously produced material. The real replacement decision is therefore not “What gas can I pour in?” but whether to keep servicing R22, retrofit a suitable system with an approved blend, or replace the equipment with a modern platform.
For many comfort-air-conditioning retrofits, R407C, R427A and R438A are among the established A1 pathways, with different oil and performance implications. Commercial refrigeration may use other transition blends such as R448A or R449A. If the equipment is near end of life, replacing the entire system with a modern lower-GWP platform can be more sensible than investing in a complex retrofit.
Start with the equipment decision, not just the refrigerant name
Replacement searches often combine several different decisions. The cards below separate the questions that must be answered before choosing a refrigerant.
No automatic retrofit mandate
EPA states existing HCFC-22 equipment can continue to be serviced; replacement is not automatically required.
R410A is not an R22 retrofit refrigerant
R410A operates at much higher pressures and should only be used in equipment designed for it.
Application decides the retrofit
R407C is strongly associated with AC, R427A is a broad general-purpose R22 retrofit route, while commercial refrigeration may favor other blends.
R22 replacement decision map
This decision graphic is designed to summarize the transition logic before readers enter the detailed replacement matrix and regulatory sections.
Main refrigerant routes discussed as R22 alternatives
“Replacement” can mean retrofit, new-equipment transition, or an entirely different system architecture. Read the final column carefully.
| Refrigerant | GWP | Safety | Type | Main Role | Typical Context | Replacement Meaning |
|---|---|---|---|---|---|---|
| R22 | 1,810 AR4 / 1,760 AR5 | A1 | HCFC | Legacy baseline | Older AC, heat pumps and refrigeration | ODS phaseout / installed-base service |
| R407C | 1,774 | A1 | HFC blend | AC-focused retrofit route | Air conditioning and selected medium-temp DX systems | Retrofit; typically POE oil |
| R427A | 2,140 | A1 | HFC blend | General-purpose R22 retrofit | AC, heat pumps, medium/low-temp DX refrigeration | Retrofit; oil return must be evaluated |
| R438A | 2,270 | A1 | HFC/HC blend | MO99 / KDD5 retrofit route | Legacy AC and refrigeration | Retrofit-oriented A1 blend |
| R448A | 1,386 | A1 | HFO/HFC blend | Commercial refrigeration transition | Low/medium-temp DX refrigeration | Application-specific retrofit/new equipment |
| R449A | 1,396 | A1 | HFO/HFC blend | Commercial refrigeration transition | Supermarkets and other low/medium-temp refrigeration | Application-specific retrofit/new equipment |
How the main R22 replacement routes differ
The most useful replacement answer depends on system condition, end use, safety class, GWP, regulation and the equipment manufacturer’s approved operating envelope.
R407C
R32 / R125 / R134a blend · GWP 1,774R407C remains one of the closest established capacity matches to R22 for many air-conditioning retrofits. Arkema identifies R407C as a principal R22 retrofit option for AC, but POE lubricant and blend handling are important parts of the conversion.
R427A
HFC blend · GWP 2,140R427A is a broad R22 retrofit blend used across air conditioning, heat pumps and refrigeration. Arkema states its mass-flow rate is within 8% of R22 and positions it as a retrofit designed to minimize system changes, while still requiring OEM/compressor review.
R438A
MO99 / KDD5 · GWP 2,270R438A is another established A1 retrofit blend for legacy R22 systems. It can be practical where owners need an installed-base solution, but its high GWP means it is not a future-facing low-GWP platform.
R448A
HFO/HFC blend · GWP 1,386R448A is particularly relevant when the R22 application is commercial low- or medium-temperature refrigeration rather than comfort AC. Honeywell positions it for R22 and R404A replacement in commercial refrigeration.
R449A
HFO/HFC blend · GWP 1,396R449A is another commercial-refrigeration retrofit and transition option. It is not a universal answer for every R22 AC system, but it is an important route for supermarkets and related DX refrigeration.
New system
Modern low-GWP platformWhen the R22 equipment is near end of life, a complete replacement can shift the project to a modern refrigerant architecture rather than locking the owner into another legacy-style retrofit blend.
Existing R22 system vs new equipment project
Keeping an installed system alive and choosing refrigerant for a new platform are different engineering decisions.
Existing R22 System
Keep, service, or retrofit depending on condition and refrigerant availabilityReplacement Equipment Project
Move beyond HCFC-22 and choose a current refrigerant platformWhy a lower-GWP alternative is not automatically a drop-in replacement
Refrigerant transitions can change safety, pressure, capacity, oil return, temperature glide, components, controls and regulatory obligations.
Ozone Depletion
R22 is HCFC-22 with ODP 0.055 under the Montreal Protocol basis used by EPA; the environmental issue is not only GWP.
Oil & Miscibility
R407C generally requires POE, while R427A may work in some mineral-oil layouts but oil return must be evaluated carefully.
Blend Glide
Most retrofit candidates are zeotropic blends, so liquid charging, bubble/dew interpretation and fractionation risk matter.
Equipment Condition
A poor-performing or worn-out R22 system will not become healthy simply because a new refrigerant is installed.
How current U.S. and EU rules affect the R22 transition
Regulation is application-specific and time-sensitive. The summaries below explain the main strategic direction without pretending every piece of equipment has the same compliance date.
United States
EPA · SNAP · Technology Transitions / ODS rulesIn the United States, production and import of new HCFC-22 ended in 2020. EPA explicitly states existing R22 equipment may continue to be serviced, and recovered/reclaimed HCFC-22 remains legal for existing equipment. That is different from a mandate to retrofit or replace every installed R22 system.
European Union
EU refrigerant / F-gas / ODS frameworkThe EU moved faster on HCFC servicing. European Commission background material notes the HCFC phaseout for refrigeration and air conditioning was completed earlier, and use of recycled/reclaimed HCFCs for servicing was limited until 2015. That makes R22 retrofit or equipment replacement much more urgent in Europe than in the U.S. installed-base context.
The EU had completed the HCFC phaseout for refrigeration and air conditioning new-use context earlier than many other developed markets.
Use of recycled or reclaimed HCFCs such as R22 for maintenance/servicing was no longer allowed in the EU framework.
Remaining R22 equipment is therefore mainly a replacement/retrofit asset-management issue rather than a normal refrigerant supply strategy.
Use the site tools to evaluate R22 replacement options
Use these tools for screening and comparison, then confirm the final retrofit or equipment route with the applicable OEM and regulatory requirements.
Refrigerant Finder
Screen refrigerants by application, system context and project goals.
Open Finder →Comparison Tool
Compare R22 with alternative refrigerants side by side.
Compare Refrigerants →GWP Calculator
Estimate direct GWP reduction from moving away from R22.
Calculate GWP →CO₂e Calculator
Convert refrigerant charge into direct CO₂-equivalent emissions.
Calculate CO₂e →Pressure-Temperature Chart
Review P-T behavior before comparing retrofit or service conditions.
Open P-T Chart →Common R22 replacement questions
Direct answers to common replacement, retrofit and phaseout questions.
What is the best replacement for R22?
There is no single best replacement. R407C is strongly associated with AC retrofits, R427A is a broad general-purpose retrofit, R438A is another established field option, and commercial refrigeration may favor R448A or R449A.
Can I still use R22 in the United States?
Yes, existing R22 equipment can still be serviced. New production and import ended in 2020, so servicing relies on reclaimed, recycled or previously produced material.
Do I have to replace my R22 system?
EPA does not require replacement solely because the system uses R22.
Can R410A replace R22?
Not as a retrofit refrigerant. R410A operates at much higher pressure and should be used only in equipment designed for it.
Can R407C replace R22?
R407C is an established R22 retrofit route for many air-conditioning systems, but POE oil and system-specific checks are normally required.
Can R427A replace R22?
R427A is specifically marketed and used as a broad R22 retrofit refrigerant, subject to OEM/compressor and installation review.
Can R438A replace R22?
R438A is another A1 retrofit-oriented option for legacy R22 systems, but its high GWP limits long-term strategic value.
Can R448A or R449A replace R22?
They can be relevant in commercial low/medium-temperature refrigeration applications, but are not universal comfort-AC retrofit answers.
What is the GWP of R22?
EPA lists HCFC-22 at GWP 1,810 on an AR4 basis and 1,760 on an AR5 basis.
What is the ODP of R22?
EPA lists Montreal Protocol ODP 0.055 for HCFC-22.
Should I retrofit or replace the entire R22 system?
Compare system age, leak history, compressor condition, energy efficiency, retrofit cost, refrigerant availability and expected remaining life.
Can different refrigerants be mixed with R22?
No. Field mixing contaminates refrigerant and creates unpredictable pressure-temperature behavior; retrofit procedures call for recovery of the original charge.
Authoritative sources used for this page
Primary regulator sources are prioritized, with technical manufacturer guidance used to explain real retrofit practice where appropriate.
EPA confirms existing HCFC-22 equipment can still be serviced and describes the 2020 production/import phaseout.
Open source →Official HCFC-22 ODP and GWP reference values.
Open source →Consumer guidance on continued servicing of existing R22 systems and post-2020 refrigerant supply.
Open source →Manufacturer technical comparison of R407C, R407A and R427A retrofit positioning and performance considerations.
Open source →Detailed R427A retrofit checklist including oil, seals, charge and blend handling.
Open source →EU background explaining earlier HCFC phaseout and the 2015 limit on recycled/reclaimed HCFC servicing.
Open source →Need help comparing replacement routes?
Start with the comparison and refrigerant-finder tools, then confirm the final choice against system condition, OEM documentation, application category and current regulations.