Written by the Refrigeration Team, specialists in refrigerant gases and European F-Gas compliance. Last updated: 20 May 2026.
R-134a (GWP 1,430) has seen its distributor price multiply 9.5-fold since 2014, according to data prepared for the European Commission in Q4 2025 (Cooling Post, 2025). Two fluids are competing to take over in industrial cooling: R-513A (GWP 631, A1 classification) for immediate retrofit, and R-1234ze(E) (GWP 7, A2L) for new-build installations. Which one should you choose? The answer depends on your chiller’s age, your budget and your compliance horizon. For the full pressure and temperature profile of the outgoing fluid, see our R-134a properties and PT chart reference.
Key Takeaways
Why replace R-134a in industry in 2026?
The EU’s HFC quota has fallen by 48% between 2023 and 2026, dropping from 82.3 to 42.9 million tonnes CO2 equivalent (Regulation (EU) 2024/573, Annex VII). The direct result: virgin R-134a now costs 3.7 times more than in 2014 at end-user level. And that is only the start. The next reduction step, in 2027, will tighten supply even further.
Should you wait until the price becomes unsustainable? In practice, no. Operators who convert now lock in a predictable fluid cost and avoid the scramble for reclaimed gas that is coming after 2027. For the full HFC phase-down timeline and the thresholds by equipment category, consult our dedicated cluster article.
R-513A or R-1234ze(E): what are the real differences?
R-513A (Opteon XP10, Chemours) is an A1 azeotropic blend whose operating pressures are nearly identical to R-134a, which allows a retrofit without major modification of the existing installation (Chemours, Retrofit Guidelines). R-1234ze(E) (Solstice ze, Honeywell) is a pure HFO, classified A2L. Its volumetric capacity is 25 to 30% lower than R-134a, which requires larger-displacement compressors and, in practice, equipment designed from the outset for this fluid.
| Criterion | R-134a | R-513A | R-1234ze(E) |
|---|---|---|---|
| GWP (AR4, 100-year) | 1,430 | 631 | 7 |
| ASHRAE 34 Classification | A1 | A1 | A2L |
| Composition | Pure HFC | R-1234yf 56% / R-134a 44% | Pure HFO (trans-isomer) |
| Blend Type | Pure substance | Azeotropic (0 K glide) | Pure substance |
| Relative COP vs R-134a | Reference (1.00) | ~0.98 to 1.00 | ~1.02 to 1.05 |
| Volumetric Capacity | Reference | ~95-100% | ~70-75% |
| Oil Compatibility | POE | POE (same oil) | POE |
| Retrofit Possible? | N/A | Yes | No (new equipment required) |
| Indicative Price (€/kg, 2025) | ~40-42 | ~30-60 | ~38-40 |
One point that is often misunderstood: R-513A is not zeotropic. It is a true azeotrope with a temperature glide of 0 K, which considerably simplifies charging and maintenance. Gauges calibrated for R-134a can be reused without recalibration.
What does an R-134a to R-513A conversion cost?
An R-134a to R-513A retrofit on a 200 kW chiller costs between €5,000 and €10,000 all-in, based on feedback from refrigeration contractors in 2025. That figure covers recovery of the old fluid, the R-513A charge (~80 kg at €35 to €45/kg, or €2,800 to €3,600), gasket replacement where needed, and labour. Why so low? Because R-513A runs on the same POE oil, the same operating pressures and the same expansion valves as R-134a.
Compare that with the cost of doing nothing. Virgin R-134a at €40 to €42/kg in 2025 has no reason to fall. The HFC quota drops again in 2027, then in 2030. Based on our observations, operators who converted in 2024 have already recouped the fluid price gap. Those who wait risk paying even higher prices for reclaimed R-134a, when it is available at all.
In practical terms, the R-134a to R-513A conversion procedure on a screw or centrifugal chiller takes one to two days. Johnson Controls has published detailed retrofit guides for its York YK and YVAA/YVWA ranges (Johnson Controls, Service Information). One important detail: R-513A must always be charged in the liquid phase to avoid fractionation of the blend.
When is R-1234ze(E) the better choice?
R-1234ze(E) makes sense when the existing installation is nearing end of life and a full chiller replacement is already planned. Laboratory tests show R-1234ze(E) cutting electricity consumption by close to 27% versus R-134a in certain configurations with an internal heat exchanger (Climalife). A higher COP, combined with a GWP of 7, makes it the strongest performer on environmental grounds.
Major manufacturers already offer full R-1234ze(E) ranges. Trane sells the XStream eXcellent GVWF magnetic-bearing chillers, spanning 380 kW to 2.1 MW with SEER ratings up to 10 (Cooling Post). Carrier has launched the AquaForce Vision 30KAV PUREtec range for process cooling, from 280 kW to 1,300 kW (Carrier EU). Data centres are the early adopters, given their round-the-clock cooling demand.
The main barrier? Upfront investment. A new 200 kW R-1234ze(E) chiller runs between €80,000 and €120,000. But the annual energy savings, combined with a fluid outside the HFC quota system, make the case pay off over 12 to 15 years. Is that relevant if your current unit still has 5 years of service life left? Probably not. In that case, R-513A remains the logical bridging solution.
Which oil and which components need to change?
Good news for R-513A: the polyolester (POE) oil used with R-134a remains compatible. In most cases there is no need to drain the oil if it is in good condition and its acidity stays within normal limits. Standard elastomer seals are fine. Thermostatic or electronic expansion valves calibrated for R-134a work with R-513A without major recalibration, since evaporating and condensing pressures are very close.
For R-1234ze(E), it’s a different story. As the fluid is classified A2L (mildly flammable), the installation must meet EN 378 requirements for charge limits, ventilation and leak detection. Electrical components in the plant room must be compatible with an A2L environment. In France, handling R-1234ze(E) falls under the category I attestation de capacite, the same certification required for other fluorinated refrigerants; check your national certification requirements before starting work.
One detail that is often overlooked: R-1234ze(E) also uses POE oil, which is compatible. But the fluid charge is larger (bigger compressor displacement) and fittings need to be checked for A2L-grade tightness. Not insurmountable, but this is not a retrofit.
What does field experience with conversions show?
The University of Kansas ran a full-scale side-by-side trial: two 900-ton (~3,160 kW) York chillers cooling the same building, one running R-134a, the other retrofitted to R-513A. Preliminary results confirm comparable cooling performance (Cooling Post, 2022). This kind of real-world, identical-machine trial is rare. It validates what manufacturer data already claims: R-513A is not a performance compromise.
On the R-1234ze(E) side, the case of French food-processing company Les Delices de la Belle Noe is well documented: a 69 kW installation with 150 kg of R-1234ze(E) serving positive-temperature (0 to +10°C) and negative-temperature (-20 to -25°C) cold storage across 400 m², on a budget under €100,000 (Climalife). Operators report lower electricity consumption and easier management thanks to being outside the quota system.
Based on our field feedback in Europe, R-513A conversions on 100 to 500 kW screw chillers go smoothly, with no particular technical difficulty. The point to watch remains a full purge of the old R-134a before recharging, since cross-contamination degrades performance. We cover that in more detail in the next section.
What mistakes should you avoid during an R-134a retrofit?
The most common mistake is contamination. Leaving R-134a residue in the circuit before charging R-513A is not a chemical compatibility issue (R-513A already contains 44% R-134a), but a significant residue skews the blend composition and alters thermodynamic performance. The rule: recover as much R-134a as possible, pull a full vacuum, then charge R-513A in the liquid phase.
Second common error: skipping the oil acid test. Degraded POE oil with a high acid number accelerates the breakdown of the R-1234yf content in R-513A. If the oil is acidic, replace it. Based on technician feedback, this step gets skipped on roughly one retrofit in three.
Third point, specific to R-1234ze(E): underestimating A2L requirements. Flammability is low (burning velocity below 10 cm/s), but it is not zero. Plant rooms need EN 378-compliant ventilation and a floor-level leak detector. For a full overview of low-GWP refrigerants and their safety requirements, see our dedicated guide.
R-513A in 2026, R-1234ze(E) in 2030: what roadmap should you follow?
R-513A remains an HFC/HFO fluid with a GWP of 631. It is compliant today, but it still contains 44% R-134a and remains subject to the EU quota mechanism. Longer term, if regulatory thresholds fall below GWP 150 for certain categories, R-513A will eventually be affected too. When exactly? The F-Gas Regulation (EU) 2024/573 does not set an explicit ban date for R-513A in industrial applications. But the trend is clear.
The most pragmatic strategy? Use R-513A as a transition solution for installations still in good condition (5 to 10 years of remaining service life), then plan the move to R-1234ze(E) or other natural alternatives when the fleet is renewed. That is what the most forward-planning operators are already doing.
For operators managing a fleet of several chillers, the logical approach is to convert the oldest units to R-513A first (minimal cost, immediate compliance benefit) and budget R-1234ze(E) replacements into the 5 to 7 year capital plan. Broader comparisons are available in our article on R-404A alternatives, which covers other transition fluids.
Frequently Asked Questions
Is R-513A a "drop-in" for R-134a?
Not exactly. R-513A is a conversion (retrofit) fluid, not a drop-in in the strict sense. The procedure involves fully recovering the R-134a, pulling a vacuum, and recharging with R-513A in the liquid phase. You cannot simply top up a R-134a circuit with R-513A. That said, no component changes are required in most cases: same POE oil, same pressures, same expansion valves.
Can R-1234ze(E) be used in an existing system designed for R-134a?
No. The volumetric capacity of R-1234ze(E) is 25 to 30% lower than R-134a. A compressor sized for R-134a will not deliver the expected cooling capacity with R-1234ze(E). You need equipment designed specifically for this fluid, with a larger-displacement compressor and a circuit that meets the A2L requirements of EN 378.
Is a specific certification required to handle A2L-class R-1234ze(E)?
In France, the category I attestation de capacite covers handling of all fluorinated refrigerants, including A2L fluids like R-1234ze(E). No additional certification is required beyond the standard attestation. However, the installer must be familiar with EN 378 requirements on charge limits and plant room ventilation. Requirements vary by EU member state, so check your national certification scheme.
Will R-513A eventually be banned?
Regulation (EU) 2024/573 does not set out a specific ban on R-513A for industrial applications. However, its GWP of 631 places it above future thresholds for certain categories (GWP 150 for plug-in cabinets since 2025). For chillers and industrial cooling, it remains usable for the foreseeable future, but HFC quota pressure will gradually push its cost up.
What is the service life of a system converted to R-513A?
Converting to R-513A does not shorten equipment service life. Thermodynamic properties and material compatibility are similar to R-134a. A converted chiller can keep running for as long as its mechanical condition allows, typically 15 to 25 years for a well-maintained centrifugal unit.
Is R-1234yf an alternative to R-134a in industrial refrigeration?
R-1234yf (GWP 4, A2L) is used mainly in automotive air conditioning. Its very high cost (often above €80/kg) and properties optimised for small charges make it unsuitable for industrial cooling. For stationary refrigeration, R-513A (which contains 56% R-1234yf) or R-1234ze(E) are the relevant choices. For more on R-134a in automotive use, see our R-134a car AC recharge cost guide.
The bottom line
The choice between R-513A and R-1234ze(E) is not a question of the “best fluid” in absolute terms. It is a question of timing and situation. If your R-134a chiller still has 5 to 10 years of life left, R-513A offers immediate compliance for a modest conversion cost. If you are planning an equipment replacement anyway, R-1234ze(E) is the long-term solution with the strongest environmental and energy profile.
The only bad decision is doing nothing. R-134a already costs 9.5 times more than in 2014 at distributor level. The next quota steps in 2027 and 2030 will only make the situation worse. Talk to a certified technician about the right refrigerant solution for your installation. And to place both fluids in the wider landscape of low-GWP alternatives, our low-GWP refrigerant guide covers the full range of options by application sector.
