Awaiting expert review. This page covers safety or regulatory rules that change over time. It is kept out of search results until a qualified reviewer has checked it; the sources below are dated so you can verify each point.
Quick answer
R-410A is a hydrofluorocarbon (HFC) refrigerant blend, sold under names such as Puron, that was the standard refrigerant in US home air conditioners and heat pumps from about 2010 until new systems moved to lower-GWP refrigerants in 2025.
It does not harm the ozone layer, but EPA lists its global warming potential at 2,088, above the 700 limit that now applies to new residential systems. Existing R-410A systems can still be used and repaired.
Quick facts
The key facts about R-410A Refrigerant, with sources:
- Type
- HFC blend; replaced R-22
- GWP (EPA reference table)
- 2,088 4
- New residential systems
- GWP 700 limit from 1 January 2025; R-410A exceeds it 1
- Pre-2025 inventory
- May still be installed if all specified components were made or imported before 1 January 2025; no deadline since July 2026 12
- Existing systems
- Can be used and repaired; EPA affirms replacing a failed condensing unit 2
- Retrofit to A2L
- Not allowed: R-454B and similar are for new equipment only 5
- Handling
- EPA Section 608 certified technicians 6
Key takeaways
- R-410A is the refrigerant in most home systems installed from about 2010 to 2024.
- Its GWP of 2,088 is above the 700 limit for new residential systems from 1 January 2025 4 1.
- You do not have to replace a working R-410A system, and it can be repaired 2.
- Replacing a failed R-410A condensing unit is allowed; replacing the indoor coil afterward counts as a new system 2.
- EPA expects R-410A prices may rise as the HFC phasedown continues, including its 2029 step 2.
What R-410A is
R-410A is an HFC blend that took over from R-22 in US home air conditioning. Unlike R-22, it has no chlorine, so it does not deplete the ozone layer. It runs at higher pressures than R-22, so equipment, gauges and hoses are built for it.
Its problem is climate. EPA's Technology Transitions table gives R-410A a GWP of 2,088, meaning one pound has the warming effect of about 2,088 pounds of carbon dioxide over 100 years 4.
Under the AIM Act, EPA set a GWP limit of 700 for new residential and light commercial AC and heat pump systems 1.
Lower-GWP replacements are R-454B (GWP 465) and R-32 (GWP 675) 4. Both are mildly flammable A2L refrigerants.
How the rules treat an R-410A system, step by step
- System already in your home → may run and be serviced; no federal replacement deadline
- Condensing unit fails → may be replaced with an R-410A condensing unit; not treated as a new system 2
- Indoor coil later replaced too → counts as installing a new system → must meet the GWP 700 limit 2
- Brand-new system wanted → must be under 700 GWP, unless every specified component was made or imported before 1 January 2025 1
How R-410A systems work
R-410A runs the standard refrigeration cycle, boiling in the indoor coil and condensing outdoors. Like other HFC systems, it uses synthetic POE oil rather than the mineral oil common in R-22 systems, one reason the two cannot be mixed.
Because it is charged at higher pressure than R-22, R-410A equipment uses heavier-rated components. Its coils, valves and line sets are not interchangeable with R-22 parts, and new A2L equipment uses its own parts too.
R-410A compared with its neighbors
| Refrigerant | GWP (EPA) | Ozone-depleting? | Status |
|---|---|---|---|
| R-22 | Not in TT table | Yes (HCFC) | No US production or import since 1 Jan 2020 9 |
| R-410A | 2,088 4 | No | Existing systems serviced; new systems only from pre-2025 components 1 |
| R-454B | 465 4 | No | For new equipment, SNAP use conditions 5 |
| R-32 | 675 4 | No | For new equipment, SNAP use conditions |
Worked example: an R-410A owner's choices by failure
How the rules, as stated in EPA's 26 May 2026 final rule and 40 CFR 84.54, apply to common failures in a home R-410A split system 2 1. This is a guide to what is allowed, not advice on which to choose.
| What failed | Allowed under the rules? | Points to weigh |
|---|---|---|
| Small leak at a joint | Yes: repair and recharge | Find the leak first; R-410A price may rise 2 |
| Compressor or whole condensing unit | Yes: R-410A condensing unit replacement is allowed | Matches the old coil; check AHRI pairing and age |
| Indoor coil after a condensing unit swap | Counts as a new system | Must then meet the 700 GWP limit |
| Both halves at once | New system | Under 700 GWP, unless all components pre-2025 1 |
| Converting to R-454B in place | No | A2L blends are for new equipment only 5 |
In short: repairs are fine; a full new system goes to the new refrigerants. If the system is old and the coil is also failing, a new low-GWP system often makes more sense than a condensing-unit swap.
How to tell if you have R-410A
- The outdoor data plate says R-410A and gives the factory charge.
- Some units carry "Puron" branding, a trade name used for R-410A.
- The install date: most systems from about 2010 to 2024 use R-410A.
- Your service ticket should name the refrigerant added or recovered.
Keeping vs replacing an R-410A system
Reasons to keep and repair
- Working systems face no federal phase-out date.
- Condensing unit replacement is allowed 2.
- Repairs usually cost less than a new system.
What you cannot do with R-410A
You cannot convert an R-410A system to R-454B or another A2L refrigerant in the field. EPA's SNAP listing allows R-454B only in new equipment designed for it 5.
You also cannot keep "rolling over" a system by replacing every part over time and call it a repair. EPA has said replacing all components over time counts as installing a new system 2.
Cost drivers and lifespan
What moves the cost of keeping an R-410A system: the size of the leak, how many pounds it needs, the price of R-410A at the time, and whether a part like the compressor or coil is failing.
EPA acknowledges R-410A prices may rise and that the 2029 phasedown step will cut HFC production and import 2.
Age matters too. EIA counted 10.55 million homes whose main AC was 20 or more years old in 2020 10. HyreHVAC does not print prices without local quotes; use the repair-or-replace calculator and our repair vs replace research.
How an R-410A repair is done (by a certified pro)
- Leak search; R-410A must not be vented 7.
- Recover remaining refrigerant into a cylinder.
- Repair the leak or replace the failed part.
- Replace the filter drier, pressure test with nitrogen, evacuate.
- Charge with R-410A by weight or to the maker's target.
- Record pounds added on the ticket.
Keeping an R-410A system going
- Yearly service that checks charge and looks for oil spots at joints.
- Clean outdoor coil and fresh filters, which reduce strain.
- Protect line-set insulation from sun, pets and string trimmers.
- Ask for superheat and subcooling numbers, not just "topped off".
- Keep records of every refrigerant addition; a pattern of top-ups is the clearest sign a leak needs fixing before the next failure.
Signs of trouble
- Needing refrigerant more than once, which almost always means an unrepaired leak.
- Ice on the suction line.
- Hissing, or oily stains at fittings.
- Compressor that hums but will not start.
- Only an EPA 608 certified technician may service the circuit 6.
Rules for R-410A (checked 10 October 2026)
New products (40 CFR 84.54(a)(1)). Effective 1 January 2025, no manufacture or import of self-contained residential and light commercial AC and heat pump products using a refrigerant with GWP of 700 or more 1.
New systems (40 CFR 84.54(c)(1)). Effective 1 January 2025, no installation of residential or light commercial AC or heat pump systems using such a refrigerant, except VRF.
Systems may still be installed where all specified components were manufactured or imported before 1 January 2025 1. EPA's 26 May 2026 rule (91 FR 31284, effective 27 July 2026) removed the earlier 1 January 2026 deadline for that inventory 2. EPA's sector table shows the same 3.
Existing equipment. Subpart B does not apply to equipment existing in the US before 27 December 2020 1. EPA states that allowing a market for specified components lets end users maintain existing systems 2.
Leak repair. EPA's Section 608 leak repair rules apply to appliances holding 50 pounds or more 8, larger than typical home systems. Venting is prohibited for all sizes 7.
R-410A vs related terms
| Term | Relation |
|---|---|
| Refrigerant | Parent term |
| R-22 | What R-410A replaced |
| R-454B and R-32 | What replaces R-410A in new systems |
| Refrigerant recovery | Required when servicing or removing R-410A systems |
| SEER2 | Efficiency rating that applies regardless of refrigerant |
Common misconceptions
- Myth R-410A systems must be replaced by 2026.
- Reality No federal rule requires replacing a working system, and the 2026 install deadline for pre-2025 inventory was removed 2.
- Myth R-410A can no longer be bought.
- Reality It can still be sold for servicing; supply shrinks under the phasedown 2.
- Myth A new R-454B condenser can go on my old coil.
- Reality Mixing refrigerants is not allowed; A2L blends are for new matched equipment 5.
State rules
The federal rules above apply in every state. Some states run their own HFC programs, and HyreHVAC has not verified each state's current rule text for this page. If you live in a state with its own program, such as California or Washington, check the state environmental agency before relying on a date.
When this matters to you
If your R-410A system works, keep maintaining it. If it fails, weigh repair against a new low-GWP system based on age, efficiency and which part failed. A failing coil on an older system usually tips the balance toward replacement.
Next step: compare new system vs repair and check heat pump rebates if you replace.
Questions about R-410A Refrigerant
Is R-410A banned?
Not for existing systems. Since 1 January 2025, new residential systems generally must use a refrigerant under 700 GWP, and R-410A is 2,088. Systems made entirely from pre-2025 components can still be installed, and existing R-410A systems can be repaired.
Can I still buy an R-410A air conditioner?
Only from inventory whose specified components were all made or imported before 1 January 2025. EPA's May 2026 rule removed the deadline for installing that inventory. Most new systems now use R-454B or R-32.
Can my R-410A condensing unit be replaced with another R-410A unit?
Yes. In its May 2026 final rule, EPA affirmed that a homeowner can replace a failed condensing unit rather than buy a whole new system. Replacing the indoor coil later counts as installing a new system.
Will R-410A get more expensive?
EPA says the price of legacy HFCs such as R-410A may rise as the phasedown continues, and that its 2029 step will cut HFC production and import. Reclaimed refrigerant will make up part of supply.
Can I switch my R-410A system to R-454B?
No. EPA's SNAP listing allows R-454B only in new equipment specifically designed for it, not as a retrofit refrigerant for systems designed for others.
What is Puron?
Puron is a brand name used for R-410A. Puron Advance is a brand name used for R-454B. Check the data plate for the refrigerant number.
Is R-410A dangerous?
It is not ozone-depleting and is not an A2L flammable refrigerant, but liquid R-410A can cause freeze burns and it is a potent greenhouse gas. Only certified technicians should handle it, and venting is prohibited.
How do I know if my system uses R-410A?
Look at the data plate on the outdoor unit, which lists the refrigerant type and charge. Systems installed from about 2010 to 2024 usually use R-410A.
Sources
- eCFR, 40 CFR Part 84 Subpart B, §§ 84.52–84.56 (version of 1 September 2026), retrieved .
- U.S. EPA, Phasedown of Hydrofluorocarbons: Reconsideration of Certain Regulatory Requirements Promulgated Under the Technology Transitions Provisions of the AIM Act, 91 FR 31284 (26 May 2026, effective 27 July 2026), retrieved .
- U.S. EPA, Technology Transitions HFC Restrictions by Sector, retrieved .
- U.S. EPA, Technology Transitions GWP Reference Table (updated 2 April 2026), retrieved .
- eCFR, 40 CFR Part 82 Subpart G, Appendix W: SNAP substitutes listed in the 6 May 2021 final rule (effective 7 June 2021), retrieved .
- U.S. EPA, Section 608 Technician Certification, retrieved .
- U.S. EPA, Stationary Refrigeration: Prohibition on Venting Refrigerants, retrieved .
- U.S. EPA, Stationary Refrigeration Leak Repair Requirements, retrieved .
- U.S. EPA, Phaseout of Class II Ozone-Depleting Substances, retrieved .
- U.S. EIA, 2020 RECS Table HC7.1, Air conditioning in U.S. homes (final data March 2023), retrieved .
Expert review
Written by the HyreHVAC Research team. Not yet reviewed by an outside expert. We say so rather than imply a review that has not happened; see our editorial policy.
How the numbers were checked: Held under G-REV. Rule text copied from the eCFR version of 40 CFR 84 Subpart B (1 September 2026).
Condensing-unit and coil statements and the price outlook from EPA's response to comments in 91 FR 31284; GWP from EPA's reference table; SNAP retrofit bar from 40 CFR 82 Subpart G Appendix W; all read 10 October 2026.
State rules not verified.
Suggest a correction. We fix errors and say what changed.