The Future of Cooling: Why Yucleo ZE(HFO-1234ze(E)) is Transforming HVAC

In the ongoing evolution of the HVAC industry, sustainability and efficiency are the two primary drivers. A next-generation refrigerant that stands out is HFO-1234ze(E) (trans-1,3,3,3-tetrafluoroprop-1-ene), which we market as Yucleo ZE. As a widely recognized, environmentally responsible alternative to traditional HFCs, Yucleo ZE is redefining how cooling and heating systems are designed and operated.

Why Yucleo ZE? 

Ultra-low Global Warming Potential (GWP)

With a GWP of less than 1, HFO-1234ze(E) has a climate impact similar to carbon dioxide and is significantly lower than legacy refrigerants like R-134a (GWP of 1,430). This makes it a crucial solution for reducing greenhouse gas emissions in the HVAC sector.

Superior Energy Efficiency

Yucleo ZE offers excellent thermodynamic performance. In many chiller, rooftop, and heat pump systems, it delivers a high Coefficient of Performance (COP), helping end-users cut energy consumption and operating costs. This isn't just a win for the environment, it’s a win for your bottom line.

Enhanced Safety Profile

Classified as an A2L (mildly flammable) refrigerant under ASHRAE Standard 34, Yucleo ZE is at the very low end of this category. Under typical ambient conditions, it does not sustain combustion, making it one of the safest low-GWP refrigerants available today while maintaining favorable toxicity characteristics.

Regulatory Readiness

With global regulations like the U.S. AIM Act phasing down high-GWP HFCs, adopting Yucleo ZE ensures long-term compliance and provides peace of mind. This refrigerant is a future-proof choice that aligns with international frameworks for a greener planet.

Applications in HVAC 

Yucleo ZE has become one of the most versatile next-generation refrigerants available. Thanks to its ultra-low GWP, strong efficiency, and regulatory compliance, it's used both as a pure refrigerant and as a key component in several blends. Its versatility makes it an ideal platform molecule for a variety of low-GWP alternatives across the HVAC and refrigeration industry.

Applications	Refrigerant	Target replacement
Centrifugal & Screw Chillers	R-1234ze(E)  R-515b	R-134a
Heat Pumps	R-1234ze(E)	R-134a
Mobile Air Conditioning (MAC)	R-444a  R-456a	R-1234yf  R-134a
Commercial and Industrial refrigeration	R-471a	R-404a

Looking Ahead 

As HVAC moves toward a low-carbon future, Yucleo ZE is playing a central role in enabling manufacturers, contractors, and end users to reduce greenhouse gas emissions without compromising on performance. Its unique balance of sustainability, safety, and efficiency makes it one of the most promising refrigerants for the decade ahead. 

At Yuji Group, we are proud to support our partners with reliable supply and technical expertise on Yucleo ZE, helping accelerate the transition to a more sustainable HVAC industry.