An outlook from Daikin on refrigerant alternatives in Europe – addressing applications, affordability, safety and future-readiness

A balanced refrigerant choice per application

Contrary to popular perception, the new F-gas regulation does not mandate an immediate ban on fluorinated refrigerants. In building applications, certain fluorinated refrigerants continue to meet a wide range of safety and performance requirements. Bernard Dehertogh, Deputy General Manager DX at Daikin Europe N.V., emphasises: “To drive the much-needed decarbonisation in the building sector, we need flexibility in refrigerant choices. There is no one-size-fits-all solution, as different applications present different challenges.”

Daikin's strategy is to select the appropriate refrigerant for each application, balancing four key factors: safety, energy efficiency, environmental impact and cost over the entire life cycle of a product.

Possible refrigerant alternatives per application

1) Refrigerant alternatives for air-to-water heat pumps in residential buildings

For residential air-to-water systems, Daikin transitioned to lower GWP refrigerants in 2017, when it began replacing R410A with R32, significantly reducing the refrigerant’s GWP to 675.

Today, R32 is the market standard, and while it remains the most cost-effective solution for air-to-water heat pumps, a shift to alternatives with a GWP below 150 will be required from 2027 onwards (for air-to-water monobloc systems and air-to-water split systems – see illustration above).

A primary alternative to R32 is R290, commonly known as propane, an A3 highly flammable refrigerant with an ultra-low GWP of 0.02. However, due to its high flammability, propane has restrictions in handling, application and installation location. Typically, a minimum distance from windows and doors, pavements or neighbouring properties must be maintained. For these applications, Daikin is launching a hydrosplit heat pump, ensuring that only trained installers handle this equipment through its ‘Stand By Me Certified Programme’.

However, it is clear that in many applications, such as apartment buildings or terraced houses with limited outdoor space, maintaining the minimum distance is not always feasible, and alternative solutions are indispensable.

Therefore, Daikin continues its research into energy-efficient alternative refrigerants, such as R454C, an A2L mildly flammable refrigerant with a GWP of 145.5, which is below the 150 GWP limit. This presents a strong alternative to ensure that all types of residential buildings can access heat pump heating in the near future.

Defining the refrigerant portfolio for the road ahead

The path forward will involve many small steps, balancing the different properties of refrigerants with the timeline of the phase-down scheme.

R32 (GWP 675 – A2L) remains the balanced refrigerant for many applications in the years to come, allowing for continued heat pump adoption in a cost-effective way.

R290 propane (GWP 0.02 – A3) provides an energy-efficient, ultra-low GWP solution for specific applications where safety requirements and installation space allow. It comes at a higher cost compared to R32, due to increased safety requirements and refrigerant properties that result in larger units.

R454C (GWP 145.5 – A2L) is a strong alternative with a lower GWP than R32, suitable for applications where propane is not an option. This refrigerant can bring affordable, efficient and safe heat pumps to a broader market. 

Finally, R744 CO₂ (GWP 1 – A1), an ultra-low GWP refrigerant already used in many refrigeration systems, offers a promising long-term option for medium and large commercial systems. It is a solution that deserves the full attention of all stakeholders in the HVAC market: component and HVAC manufacturers, as well as their engineering and installer partners, with the aim of launching the next generation of direct expansion systems.

Ready for the future

“Daikin is continuing its research and development into alternative refrigerants to accelerate the adoption of heat pumps across all systems and applications. We encourage the entire industry to follow this path. In the future, there may even be solutions that are not yet in the public eye”, says Bernard Dehertogh. “As a manufacturer, we will take responsibility and provide the education and training needed to adopt these new technologies.”

“At the same time, we should not forget that today's heat pump solutions, such as those based on R32, have already significantly reduced CO₂ emissions compared to fossil fuel heating. Therefore, we should continue to use these solutions to transition to clean heating based on renewable energy in the medium term”, adds Dehertogh.

All appliances placed on the market before their respective cut-off dates specified in the revised F-gas regulation can be sold, operated, maintained and repaired throughout their entire life cycle.

Did you know?

With the new F-gas regulation (EU 2024/573), some labelling values for refrigerants have been updated. This applies to two refrigerants mentioned in this text. The GWP value for R454C has been reduced from 148.3 (in accordance with F-Gas Regulation EU 517/2014) to 145.5. The GWP value for R290 (propane) was also updated, from 3 (according to assessment report 4) to 0.02.

All GWP values indicated in this text are based on the revised F-gas regulation EU 2024/573.