R-410A vs. R-22: what changed and what it means for your AC
If your air conditioner is older, the label may say R-22. If it is newer, it likely says R-410A. The difference shapes your repair and replacement choices.
The short answer
R-22 is the older refrigerant, found in most central air conditioners and heat pumps built before about 2010. R-410A replaced it because R-22 damages the ozone layer. The two are not interchangeable. A system is built for one or the other.
Check the nameplate on the outdoor unit. It lists the refrigerant type.
How do R-410A and R-22 differ?
| R-22 | R-410A | |
|---|---|---|
| Typical equipment | Built before about 2010 | Built from roughly 2010 onward |
| Ozone impact | Harms the ozone layer | Does not harm it |
| Operating pressure | Lower | Higher, so parts are built stronger |
| Availability | New production ended in the U.S. | Still available, being phased down |
Because R-410A runs at higher pressure, its compressor, coil and lines are made differently. You cannot swap one refrigerant for the other in an existing system.
Why is R-22 hard to find?
The U.S. ended production and import of new R-22 at the start of 2020, under the Clean Air Act. What remains is recovered or stockpiled supply, and it is scarce. That is why servicing an R-22 system can become a real problem.
Federal rules also cover who may buy and handle refrigerant. It takes EPA Section 608 certification. This is a job for a licensed technician, not a weekend project.
What if your system still uses R-22?
Running a working R-22 system is not illegal, and you do not need to replace it the day you read this. If it leaks, though, repairs get harder, because the refrigerant itself is the scarce part. In an old system, a leak is often your cue to start planning a replacement, not to keep topping it off.
If the system runs fine, keep up with filters and yearly tune-ups, and ask a licensed contractor how much life it has left. Do not replace a healthy unit just because of the label.
Is R-410A going away too?
Slowly. Federal rules under the AIM Act are phasing down high-impact refrigerants, and newer residential systems are moving to lower-impact blends. R-410A equipment already in homes will keep being serviced for years. Still, if you are replacing a system now, ask what refrigerant the new equipment uses.
This article does not quote prices, rebates or tax credits. They change and vary by state and utility, so ask a local licensed contractor.
Frequently asked questions
Can I use R-410A in an R-22 system?
No. The two run at different pressures and use different oils and components. Mixing them can damage the system. Only a licensed technician should work on the refrigerant circuit.
Is it illegal to run an R-22 air conditioner?
No. Production and import of new R-22 ended in 2020, but you can keep running an existing system. Repairs that need refrigerant are what get difficult.
Can I buy refrigerant to top off my AC myself?
No. Buying and handling refrigerant in the U.S. requires EPA Section 608 certification. A low charge also means a leak, which a licensed technician needs to find.
Sources
What this page explains is based on these official sources. If you check one and it does not match what you read here, send it to us and the article gets corrected.
- ENERGY STAR. Energy Savings at Home: Heating & Cooling
- US EPA. Section 608 of the Clean Air Act