The short answer
R-448A is an HFC and HFO blend used in commercial refrigeration as a replacement for R-404A and R-22. Its global warming potential of about 1,387 is roughly a third of R-404A's, which puts it under the EPA's interim limit of 1,400 for new remote condensing units. Existing systems are often retrofitted to it.
On this page
If a technician has mentioned R-448A on a quote, it is probably because your system runs on R-404A and the price or the rules are pushing toward something else. This note explains what R-448A is, why it is common in commercial refrigeration now and what the 2026 rules mean for owners.
What it is
R-448A is a blend of five refrigerants: two HFOs (R-1234yf and R-1234ze) and three HFCs (R-32, R-125 and R-134a). Blending lets the makers match the pressures and capacity of R-404A, the refrigerant in a large share of walk-ins, reach-ins, display cases and racks built in the last 25 years, with a much lower global warming potential (GWP).
| Refrigerant | Typical use | GWP (about) |
|---|---|---|
| R-22 | Older systems, no longer produced | 1,810 |
| R-404A | Walk-ins, cases, racks | 3,922 |
| R-448A | Retrofits and new systems | 1,387 |
| R-449A | Close alternative to R-448A | 1,397 |
| R-744 (CO2) | Newer supermarket systems | 1 |
GWP figures are the 100-year values commonly used in US regulation.
Why it matters now
Two sets of EPA rules under the AIM Act shape refrigerant choices.
Limits on new systems. The Technology Transitions rules set maximum GWP values for new refrigeration equipment. In May 2026 the EPA relaxed some of them on an interim basis. For new retail food remote condensing units, the limit is now 1,400 from July 27, 2026, with the original limits of 150 or 300 returning on January 1, 2032. For new supermarket systems, an interim limit of 1,400 applies from January 1, 2027, again tightening in 2032. Cold storage warehouses have an interim limit of 700.
At about 1,387, R-448A sits just under the 1,400 limit. That is why it, and the similar R-449A, became the default refrigerants for new condensing units and supermarket systems in this interim period. From 2032, new systems will need far lower GWP options.
Supply and price of R-404A. The HFC phasedown cuts the total supply of HFCs over time. R-404A, with its high GWP, uses up allowances fastest, so it has become more expensive to buy for recharges.
None of these rules stops you from repairing an existing R-404A system with R-404A. The limits apply to new installations.
Retrofitting an R-404A system
Many existing systems are converted to R-448A rather than replaced. A retrofit usually involves:
- Recovering the R-404A charge (by an EPA Section 608 certified technician).
- Checking the compressor maker’s approval for R-448A and the oil type. Most R-404A systems already use polyolester oil, which works with R-448A.
- Adjusting or replacing the expansion valve and changing the filter drier.
- Charging with R-448A as a liquid, because it is a blend.
- Relabeling the system with the new refrigerant.
R-448A has a temperature glide of several degrees, meaning it evaporates and condenses over a range of temperatures rather than at one point. Technicians set superheat and subcooling with that in mind. Capacity is close to R-404A in most medium-temperature uses; some low-temperature systems lose a little.
Leaks still count
R-448A is still an HFC blend, so the EPA leak repair rule applies to it. From January 1, 2026, commercial refrigeration holding 15 pounds or more of a refrigerant containing an HFC with a GWP above 53 must have its leak rate calculated each time refrigerant is added. A system leaking more than 20% a year has to be repaired within 30 days, with verification tests, and records kept for three years. Larger systems need regular leak inspections.
A retrofit is a good moment to fix leaks properly, since the system is open anyway.
Should you retrofit or replace?
| Situation | Usual direction |
|---|---|
| Sound system, leaks fixed, R-404A cost rising | Retrofit to R-448A |
| Compressor failed on an old condensing unit | Price a new unit, which will use a compliant refrigerant |
| R-22 system | Replace; R-22 is no longer produced |
| Rack being expanded | Check the 15% capacity allowance in the 2026 rule |
The compressor and condensing unit page covers typical prices for new units, and the cost estimator gives a range for leak repair and recharge.
What to ask your technician
- Is my system approved for R-448A by the compressor maker?
- What parts change in the retrofit, and what does the capacity look like afterward?
- Will you find and repair leaks before charging?
- Will the work order record the refrigerant recovered and added?
If you want a refrigeration technician to look at a retrofit or a leaking system, our commercial refrigeration repair form will start a search for one who covers your area.