Find out what refrigerant your system uses, roughly how much it holds, why it could be low, and whether the quote you were handed looks reasonable.
This section exists for one situation: a technician has told you your system is low on refrigerant, and you have no way to judge what you just heard. We are not going to teach you to charge a system — that is licensed work, and for good reason. We are going to give you enough to understand your own equipment and ask the right questions.
Something wrong right now? Start with common refrigerant problems — a symptom-first table showing what each one usually means, what else causes exactly the same thing, and what to check before you accept a refrigerant diagnosis.
Refrigerant does not get used up
An air conditioner does not use up refrigerant. Refrigerant circulates in a sealed loop, changing between liquid and gas over and over. It is never consumed the way gasoline or filter media is. A system that was correctly charged should still hold that charge years later.
So if a technician says your system is low, the useful next question is not “how much will a refill cost” but “where did it go?” There are only a few real answers: it leaked, it was undercharged when it was installed, or some was lost during an earlier repair. All three are legitimate. What is not legitimate is treating an annual top-off as routine maintenance.
The EPA puts it plainly in its own homeowner guidance: major leaks rarely develop in properly installed and maintained systems, and homeowners should ask a technician to locate and repair the leak rather than top it off.
Two honest caveats, because this gets oversimplified in both directions. A very small loss over many years can come from ordinary seepage or an old service connection, and does not by itself mean anything is wrong. And a technician legitimately has to add refrigerant after opening the system for a repair. Neither of those makes a repeated yearly recharge normal.
Start here: what refrigerant do you have?
Everything else on this page depends on this one answer, and it takes about thirty seconds to get right if you can see your outdoor unit.
How to find and read the data plate on your outdoor unit — it is usually a metal or foil label on the side of the condenser, and the refrigerant is printed on it.
Which refrigerant is in equipment from which era
If you cannot get to the nameplate, the manufacture year narrows it down considerably. How much it narrows it down depends heavily on the era.
| Equipment era | Most likely refrigerant | Confidence from year alone | Notes |
|---|---|---|---|
| Before ~1996 | R-22 | very high | R-22 was the dominant residential refrigerant for decades. A system this old is also well past typical service life, so refrigerant identification is usually a replacement-planning question rather than a repair question. |
| 1996-2004 | R-22 (also R-410A) | medium high | R-410A existed and was being adopted early by some manufacturers, but R-22 was still the default in this window. |
| 2005-2009 | R-410A (also R-22) | medium | The genuine transition period. Both refrigerants were in active production for new residential equipment, and the split varies by manufacturer and product line. This is the era where checking the nameplate matters most. |
| 2010-2021 | R-410A | very high | New residential air conditioners and heat pumps could no longer be manufactured pre-charged with R-22 from January 1, 2010, which makes R-410A the near-certain answer for equipment built in this window. |
| 2022-2024 | R-410A (also R-32) | high | Late R-410A era for central split systems. Ductless mini-splits are the exception: several manufacturers moved those to R-32 well before the 2025 rule, so a mini-split from these years is meaningfully more likely to be R-32 than a central system from the same year. |
| 2025 and newer | R-454B (also R-32, R-410A) | medium high | New equipment manufactured or imported from January 1, 2025 must use a refrigerant under GWP 700, so R-454B or R-32. R-410A stays on this list because equipment built before that cutoff may still be installed with no deadline under EPA’s May 2026 reconsideration rule, which means a system INSTALLED in 2025 or 2026 can legitimately still be R-410A. Installation year is not manufacture year. |
| Any age, after a retrofit | Could be another approved refrigerant | low | A system of any age may have been retrofitted to a different approved refrigerant, most often an R-22 system converted to R-407C, R-438A, R-422B, or R-417A. A retrofit should be recorded on a service sticker applied near the nameplate. When the nameplate and the service sticker disagree, the service sticker describes what is actually in the system. |
The year gives us a probability. The equipment label or manufacturer documentation gives us the answer. Never infer refrigerant from installation date alone when the nameplate is readable — and since EPA removed the R-410A installation deadline in May 2026, a system installed in 2025 or 2026 can still legitimately be R-410A.
The full refrigerant timeline, including what changed in 2025 and 2026.
The refrigerants you are likely to meet
A1 · GWP 1,810 · common 1960–2010
If your outdoor unit was made before about 2010, R-22 is the most likely refrigerant in it. The EPA does not require you to replace an R-22 system, and it can still be serviced.
A1 · GWP 2,088 · common 1996–2024
R-410A is in the large majority of residential central AC and heat pump systems installed between roughly 2010 and 2024. It is being phased down, not banned.
A2L · GWP 675 · common 2018–present
R-32 shows up first in ductless mini-splits, where several manufacturers adopted it well before the 2025 rule, and now in some new central equipment. It is a single compound rather than a blend, which means it does not fractionate and can be topped off as a vapor charge.
A2L · GWP 466 · common 2025–present
If you bought a central AC or heat pump in 2025 or later, R-454B is the most likely refrigerant in it. Most major US manufacturers chose it over R-32 for residential split systems because its operating pressures are close to R-410A, which let them carry over much of the existing equipment design.
A1 · GWP 1,774 · common 2000–present
If your system’s label says R-22 but a service sticker says R-407C, your system was retrofitted at some point. That is a legitimate, EPA-recognized path for an R-22 system.
Also on file: R-438A, R-422B, and R-417A — retrofit blends you will only see if an R-22 system was converted rather than replaced. Compare all of them in one chart.
What refrigerant work actually costs
These are the ranges we compare quotes against. They are market-survey figures rather than manufacturer data, so treat them as a sanity check rather than a price list.
| Line item | Typical range | Midpoint |
|---|---|---|
| Diagnostic fee | $70–$200 | $125 |
| Leak detection | $100–$330 | $200 |
| R-410A per pound, installed | $50–$80 | $65 |
| R-22 per pound, installed | $150–$300 | $220 |
| R-454B per pound, installed | $60–$100 | $80 |
| R-32 per pound, installed | $50–$90 | $70 |
| Recovery / evacuation | $100–$300 | $175 |
| Schrader valve / valve core replacement | $150–$400 | $250 |
| Line-set leak repair (accessible braze) | $200–$1,000 | $500 |
| Evaporator coil replacement | $600–$2,900 | $1,500 |
| Condenser coil repair or replacement | $600–$2,500 | $1,400 |
| Compressor replacement | $1,200–$4,000 | $2,300 |
Collected 2026-08-31. Aggregated market-survey figures, not manufacturer or regulator data. Regional pricing varies widely, and an emergency or after-hours call legitimately costs more.
Run your own quote through the checker to see how each line compares, or read why a recharge costs what it does.
The questions people arrive with
Symptom-first table, with the cheaper causes that look identical Does refrigerant run out? →
No. Here is what being low actually means Is there a refrigerant shortage? →
What the AIM Act does, and what it does not require of you How does refrigerant actually work? →
The four-stage cycle, without the engineering degree Is a leak dangerous? →
Smell, skin contact, and the one smell that is urgent Compare every refrigerant →
Type, safety class, GWP, era, and cost in one chart
When the repair stops being the real question
Sometimes the refrigerant quote is reasonable and the system still is not worth fixing. That is a different calculation, and it deserves actual numbers rather than a gut call.
Before you approve the work
Twenty questions, grouped by when you would ask them. Most technicians will answer all of these without blinking, and a good one volunteers half of them first.
The full technician question checklist →
Where this site stops
We will help you understand your equipment, read your invoice, and ask better questions. We will not tell you how to buy refrigerant, connect gauges, or charge a system. Opening a sealed refrigerant circuit requires EPA Section 608 certification under federal law, and there is no homeowner exemption. Venting refrigerant is separately illegal. This is genuinely a licensed-technician job, and the reason is legal as much as technical.
Related: AC repair vs replace · Frozen evaporator coil · AC not cooling · R-410A pressures on a 95° day · Find an HVAC pro
Frequently asked questions
Does an air conditioner use up refrigerant over time?
No. Refrigerant circulates in a sealed loop and is not consumed. If a system is meaningfully low, it leaked, it was undercharged at installation, or refrigerant was lost during an earlier repair. An annual top-off is not normal maintenance.
How do I find out what refrigerant my AC uses?
Look for a label on the outdoor condenser unit, usually a metal or foil plate on the side. It lists the refrigerant type and often the factory charge. If a service sticker names a different refrigerant than the original plate, the system was retrofitted and the sticker is what is actually inside.
Do I have to replace my R-22 system?
No. The EPA does not require homeowners to replace R-22 equipment, and it can still be serviced with reclaimed or pre-2020 refrigerant. What changed is cost: no new R-22 has been produced or imported in the US since January 1, 2020.
Is R-410A banned?
No. R-410A is being phased down, not banned. New residential systems manufactured from January 1, 2025 must use a refrigerant under GWP 700, which excludes it, but existing systems remain legal to own, service, and recharge. EPA removed the installation deadline for pre-2025 equipment in May 2026.
Why is refrigerant so much more expensive from a contractor than online?
The invoice price covers a licensed technician’s time, EPA 608 certification, recovery and evacuation equipment, refrigerant carried as truck stock, insurance, and a warranty on the work. A markup over a wholesale cylinder price is normal. Compare the total job cost rather than the per-pound figure.
Sources & verification
✓ Verified against a manufacturer, regulator, or standards source
- EPA, “Technology Transitions HFC Restrictions by Sector” — epa.gov
- EPA, “Homeowners and Consumers: Frequently Asked Questions” (HCFC phaseout) — epa.gov
- GWP values computed from the component exchange values in Appendix A to 40 CFR Part 84, the AIM Act regulated-substance list, rather than copied from secondary sources — epa.gov
⚠ Provisional — market-survey estimate, not a manufacturer or regulator citation
- Cost ranges are aggregated from HVAC cost-guide market surveys, collected 2026-08-31. They are not manufacturer or regulator figures, and regional pricing varies widely.
Last reviewed 2026-08-31. How we verify what we publish →
