R-454B vs R-32 comes down to brand more than performance for most buyers: both are mildly flammable A2L refrigerants that replace R-410A in new systems, and both meet the federal limit of a GWP below 700. R-454B has a lower GWP of about 466, and brands such as Carrier and Rheem use it, while Daikin, Goodman and Amana use R-32, at 675.
Information checked on November 4, 2026. Neither refrigerant can go into an existing R-410A system, so the choice only matters when you buy new equipment.
R-454B vs R-32 at a glance
| Feature | R-454B | R-32 |
|---|---|---|
| What it is | A blend of R-32 and R-1234yf | A single-component refrigerant |
| GWP (100-year) | 466 (465 in some sources) | 675 |
| Safety class | A2L (mildly flammable) | A2L (mildly flammable) |
| Example brands | Carrier, Rheem, Ruud | Daikin, Goodman, Amana |
| Retrofit into R-410A systems | No | No |
How R-454B and R-32 differ
R-454B is a blend of R-32 and R-1234yf with a GWP of 466, according to the International Institute of Refrigeration. In ACHR News, Carrier’s Bob Swilik said R-454B has “a slightly lower capacity with slightly higher efficiency than R-410A.” Similarly, AAON says R-454B closely mirrors R-410A in capacity and properties, so it requires minimal redesign.
R-32, by contrast, is a single-component refrigerant. Daikin says that makes it easier to clean, reuse, recover and reclaim than blends, and it claims R-32 systems are up to 12% more efficient than similar R-410A systems. However, AAON notes that R-32 requires more extensive product redesign.
Keep the efficiency claims in perspective. Both come from companies that sell the products, so compare the actual SEER2 and HSPF2 ratings of the models you’re quoted. See SEER2 explained for how to read them.
Safety: what A2L means in your home
Both refrigerants fall into the A2L class, which means they’re mildly flammable, ACHR News explains. Even so, R-454B “is not a highly flammable refrigerant like R-290 (propane),” the same article notes. As a result, A2L systems include safety features, such as leak sensors placed on or near the evaporator coil, according to a Copeland article on the ACCA blog.
These rules also affect how contractors install a system. For example, North Carolina’s fire marshal says a gas furnace can stay with a new A2L coil only if the instructions allow it, with the leak detector connected to the furnace blower. That’s why the installer should follow the manufacturer’s instructions closely.
Which brands use R-454B vs R-32
- R-454B: Carrier chose R-454B for its ducted residential systems in North America, ACHR News reported. In addition, Rheem’s RA16AY and Ruud’s UA16AY air conditioners use R-454B, as our Rheem vs Ruud comparison details.
- R-32: Daikin says R-32 is endorsed by Daikin, Goodman and Amana. For instance, Goodman’s current heat pump lineup uses R-32, as our Goodman heat pump review shows.
For other brands, check the spec sheet or ask the contractor. Since parts aren’t interchangeable, the refrigerant also decides which technicians and parts you’ll need for future repairs. For brand comparisons, see our best HVAC brands guide.
R-454B vs R-32: cost and service
Refrigerant prices vary, and few sources list both. For example, Angi puts R-454B at about $80 per pound, compared with $12 to $25 for R-410A on the same page. Unfortunately, we found no comparable consumer price for R-32 from a reliable source.
In practice, the refrigerant is a small part of the system price. So compare installed quotes, warranties and efficiency ratings rather than refrigerant alone. Also, see our AC replacement cost and heat pump cost guides.
What it means for buyers
- First of all, don’t pick a system by refrigerant alone; both meet federal rules.
- Then compare SEER2, HSPF2 and noise ratings across the brands you’re quoted.
- Next, check the warranty and whether local contractors service that brand.
- After that, if you’re replacing only the outdoor unit, ask about the indoor coil. North Carolina’s fire marshal says you must replace an R-410A coil when switching to an A2L outdoor unit.
- Finally, ask how the installer handles A2L safety requirements, including leak sensors.
If you still have an R-410A system, read the R-410A phase-out first, since you may be able to keep repairing it.
R-454B vs R-32: FAQ
Is R-454B or R-32 better?
Neither is clearly better for homeowners. R-454B has a lower GWP, while Daikin says R-32 is easier to recycle and can be more efficient. In the end, the specific model’s ratings matter more.
Are R-454B and R-32 safe?
Both are mildly flammable A2L refrigerants, so systems include safety measures such as leak sensors. Still, ACHR News notes that R-454B isn’t highly flammable like propane.
Can I put R-454B or R-32 in my R-410A system?
No. ACHR News says you can’t retrofit R-454B into existing R-410A or R-22 systems, and Copeland says refrigerants and components aren’t interchangeable.
What GWP limit applies to new systems?
Since January 2025, new residential AC and heat pump systems must use refrigerants with a GWP below 700, according to the ACCA blog.
Sources and review
Sources: International Institute of Refrigeration, leading alternative to R410A (May 29, 2019); ACHR News, R-454B emerges as a replacement for R-410A (August 2, 2020); Daikin North America, R-32; AAON, refrigerant classifications A2L and A1 (2025); ACCA blog (Copeland), repair or replace and the shift to A2L refrigerants (modified August 5, 2025); NC Office of State Fire Marshal, partial replacement with A2L refrigerant (June 6, 2025); Angi, AC recharge cost (2026). All checked on November 4, 2026.
Written by: HVAC Switch. Last updated: November 4, 2026. Read our editorial policy to learn how we research prices, or contact us if you spot an error.