Commercial Refrigeration Refrigerants — R-404A, R-407C, R-448A

Walk-in coolers, supermarket cases, ice machines, reach-in freezers, and process-cooling chillers each have their preferred refrigerant. We stock the three most common commercial-refrigeration HFCs in virgin, factory-sealed cylinders.

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R-404A — the legacy workhorse

R-404A is a near-azeotropic blend (R-125 / R-143a / R-134a, 44/52/4) widely used in commercial freezing and refrigeration since the early 2000s. It's a high-GWP refrigerant (3,922) that the AIM Act phases down aggressively. New equipment manufacturing using R-404A in stationary applications was largely prohibited as of January 1 2025 in supermarket and some commercial refrigeration applications. Service refrigerant remains legal indefinitely. Most existing walk-ins, ice machines, and low-temp display cases run R-404A.

R-407C — the R-22 retrofit standard

R-407C (R-32 / R-125 / R-134a, 23/25/52) was developed as a R-22 retrofit refrigerant. GWP 1,774. Performance closely matches R-22 in most equipment with an oil change to POE. Common in retrofitted supermarket racks, older split air conditioners that were converted from R-22, and some industrial process applications. Has noticeable temperature glide (~7°F) so charging requires liquid-line measurements rather than vapor.

R-448A (Solstice N40) — the R-404A replacement

R-448A is Honeywell's Solstice N40 — an R-32 / R-125 / R-1234yf / R-134a / R-1234ze blend (26/26/20/21/7). GWP 1,387, well below R-404A's 3,922. It's the leading retrofit option for existing R-404A supermarket racks looking to lower GWP exposure ahead of state-level (CA AB-32, NY-CARB) phase-down regulations. Performance is comparable to R-404A in most equipment with no compressor changes; oil flush to POE 32 typically required if the system was running mineral or alkylbenzene.

Picking the right one for the job

If you're servicing existing equipment, charge the refrigerant the dataplate specifies. If you're retrofitting away from R-22, R-407C is the standard drop-in. If you're retrofitting away from R-404A to lower GWP exposure, R-448A is the common choice — though R-449A (Chemours Opteon XP40) is functionally similar if your distributor stocks that instead. For new commercial refrigeration installations, US OEMs are increasingly specifying CO₂ transcritical, R-290 (propane) for self-contained, or R-454C — none of which we stock.

Don't mix glides and azeotropes

R-404A is near-azeotropic (zero glide); R-407C and R-448A are zeotropic blends with noticeable glide. Service procedures differ — always charge zeotropic blends in liquid form, never vapor, to maintain blend ratio. Topping off a zeotropic system after a partial leak introduces blend drift over time; if a system has lost more than 25% of charge, recover and recharge from the cylinder rather than topping off.

Frequently asked: Commercial Refrigeration

Is R-404A still legal to buy and install?

Yes for service of existing equipment. New equipment manufacturing using R-404A in supermarket and certain commercial refrigeration applications was prohibited under EPA SNAP and AIM Act rules effective January 1 2025, but service refrigerant remains fully legal indefinitely under 40 CFR Part 82. EPA Section 608 required.

What's the difference between R-448A and R-449A?

R-448A (Honeywell Solstice N40) and R-449A (Chemours Opteon XP40) are functionally similar low-GWP retrofits for R-404A systems. Both have GWP around 1,300-1,400 and similar capacity / efficiency. R-449A typically has slightly lower glide. Most contractors pick whichever their distributor stocks; performance differences in real installations are small.

Can I replace R-22 with R-407C without changing components?

Mostly yes — R-407C was specifically designed as a R-22 retrofit. You'll need to flush mineral oil and switch to POE 32, recover all R-22, charge R-407C in liquid phase to handle the glide, and verify expansion-device sizing. Compressors, condensers, and metering devices designed for R-22 typically work with R-407C without replacement.

How much commercial refrigerant should I keep in my truck?

For mixed commercial work, most contractors stock one R-404A 24 lb, one R-407C 25 lb, one R-410A 25 lb, and one R-22 30 lb cylinder on the truck. R-448A is increasingly added for shops doing retrofit work on supermarket racks. Bulk-pricing tiers kick in at 20 cylinders so most shops do a quarterly stock-up rather than per-job ordering.

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