Accelerating Clean Cooling & Heating

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01

Why this matters

Most refrigeration runs on chemicals that warm the planet, or quietly poison it.

HFCs warm the atmosphere up to 14,000× more than CO₂. Their HFO replacements break down into TFA, a forever chemical now detectable in rain, ice, and human blood.

The answer

CO₂, ammonia, hydrocarbons. Proven for over a century. They don't warm the planet, and they don't leave a forever chemical behind.

Natural refrigerants avoid both.

02
Primary metric

A year of avoided emissions, made visible.

GHG emissions Fenagy avoided over the lifetime of 2025's equipment placed in the market.

Fenagy · 2025

520,000metric tons of CO₂e avoided.

Over the lifetime of 2025's equipment placed in the market. The comparisons that follow show what that volume actually looks like.

03
In real-world terms

What it adds up to.

70k
homes / year
powered for a year on the same footprint
121k
petrol cars off the road
for one year of driving emissions avoided
2.2B
km not driven
distance equivalent never burned in a tank
7.0%
of Copenhagen Metropolitan Region's
annual emissions in 2020
04
Hidden pollutant

TFA: the forever chemical you haven't heard of.

Trifluoroacetic acid is an ultra-short-chain PFAS that forms as a breakdown product of synthetic refrigerants and accumulates in rainwater. Natural refrigerants don't break down into TFA.

Stage 1 · Emission

HFCs and HFOs leak from refrigeration systems.

Synthetic refrigerants escape over the lifetime of every system: installation, service, end-of-life. The leaks are small, but they add up across millions of installations worldwide.

Refrigerant gas leaking from cooling equipment
05

Growth

Cumulative avoided CO₂e emissions over the years.

Fenagy has been ATMO Approved since 2023, now 4 consecutive years of independently verified impact.

0
metric tons of CO₂e · GWP 20 years
0
metric tons of CO₂e · GWP 100 years
06
Founder

In the words of the people who built it.

Being re-approved by ATMOsphere confirms that we deliver on our promises. Our ambition is simple: to decarbonise heating and cooling using natural refrigerants - because it lowers climate impact and delivers strong, long-term performance. There should be no compromise between performance and responsibility. With natural refrigerants, there doesn’t have to be.

Kim G Christensen (Managing Director)
07
Voices from the field

What operators say after a year on natural refrigerants.

Kari Pajunen
Project Manager
Nevel Oy
Performance
How has the system performed over the past year?

The heat pump plant has performed as expected.

Kari Pajunen
Project Manager
Nevel Oy
Quality & Reliability
How has the build quality and reliability held up?

There have been a few minor equipment failures, but Fenagy has addressed them proactively, even before we have noticed the defects ourselves.

Kari Pajunen
Project Manager
Nevel Oy
Safety
How has safety been operating natural refrigerants?

The supplier has made the necessary security-enhancing changes that we have requested.

Kari Pajunen
Project Manager
Nevel Oy
Service
How was the level of service and technical support?

I have been pleased with the technical support provided by the project staff so that we can build a functioning, safe facility together.

Kari Pajunen
Project Manager
Nevel Oy
Satisfaction
Would you work with this company again?

If a suitable target is found and the procurement terms are right, I will be happy to cooperate with the supplier. Things have gone well and we have been able to agree on things during the project.

Kari Pajunen
Project Manager
Nevel Oy
Training
Did the training prepare your team to run the system?

Heat pump users have received training and additional training is coming this spring.

Jakob Rohweder
Engineering Project Manager
HanseWerk Natur GmbH
Performance
How has the system performed over the past year?

The system reliably achieves the expected efficiency levels and operates stably within the intended performance range. In addition, Fenagy made efforts to further optimize the system’s efficiency during the commissioning and testing phases.

Jakob Rohweder
Engineering Project Manager
HanseWerk Natur GmbH
Quality & Reliability
How has the build quality and reliability held up?

The technology has proven to be very reliable so far and has performed well during ongoing operation. Technical challenges were resolved smoothly and very quickly. The personnel involved appeared highly competent and qualified. Since the completion of the testing phase, no system failures have occurred. The quality of the documentation and the operating manual is generally solid, but still offers potential for further improvement to complete the overall very positive impression of the system.

Jakob Rohweder
Engineering Project Manager
HanseWerk Natur GmbH
Safety
How has safety been operating natural refrigerants?

The system meets all safety-related requirements. In addition, the cooperation and communication with the authorized inspection body were excellent. All requirements were implemented carefully and accompanied thoroughly.

Jakob Rohweder
Engineering Project Manager
HanseWerk Natur GmbH
Service
How was the level of service and technical support?

Fenagy’s service was professional, well‑structured, and aligned with our requirements. Our specific needs were also successfully implemented on site. Fenagy worked in a highly solution‑oriented manner and delivered the agreed services on time and as promised.

Jakob Rohweder
Engineering Project Manager
HanseWerk Natur GmbH
Satisfaction
Would you work with this company again?

Overall, we are very satisfied with the cooperation and will consider the Fenagy system again for future projects. The combination of technical expertise and reliable execution has been convincing.

Jakob Rohweder
Engineering Project Manager
HanseWerk Natur GmbH
Training
Did the training prepare your team to run the system?

Fenagy provided practical, hands‑on training on the system for the operating staff and supplied the necessary documentation. In addition, Fenagy has been consistently accessible and provides reliable support for any technical inquiries.

Jens Enevoldsen
CEO
Billund Varme
Performance
How has the system performed over the past year?

The system has met our expectations. We have produced the expected 16 MW at 0 degrees Celsius. As a supplier, Fenagy has met our expectations.

Jens Enevoldsen
CEO
Billund Varme
Safety
How has safety been operating natural refrigerants?

The Machinery Directive and CE marking must be complied with and this is the case.

Jens Enevoldsen
CEO
Billund Varme
Service
How was the level of service and technical support?

So far the plant has performed as expected and Fenagy has serviced and repaired as expected during commissioning.

Jens Enevoldsen
CEO
Billund Varme
Satisfaction
Would you work with this company again?

We can recommend Fenagy, provided they are able to deliver the exact system specifications requested, particularly with regard to control and regulation.

Jens Enevoldsen
CEO
Billund Varme
Training
Did the training prepare your team to run the system?

We received training.

Lars Damkjær
Manager
Gram Fjernvarme
Performance
How has the system performed over the past year?

Yes. The conditions are met 100%.

Lars Damkjær
Manager
Gram Fjernvarme
Quality & Reliability
How has the build quality and reliability held up?

We have experienced a single breakdown. This was immediately resolved by Fenagy.

Lars Damkjær
Manager
Gram Fjernvarme
Safety
How has safety been operating natural refrigerants?

Yes. We have completed an on-site course.

Lars Damkjær
Manager
Gram Fjernvarme
Service
How was the level of service and technical support?

We have received and continue to receive very good service. The level is very high.

Lars Damkjær
Manager
Gram Fjernvarme
Satisfaction
Would you work with this company again?

I would like to work with Fenagy again. The company is reliable and fulfills all obligations on time.

Lars Damkjær
Manager
Gram Fjernvarme
Training
Did the training prepare your team to run the system?

Yes. We received training and education in CO2 refrigerant.

08
The company

Fenagy: company profile.

Fenagy is a leading manufacturer of industrial heat pumps and refrigeration systems, and their vision is to help the transformation of the energy system into a greener and more sustainable one. The company has two focus areas: the district heating sector, where its electrical heat pumps prevent the burning of fossil fuels, and the industry, where its combined heating and cooling systems can reuse all waste energy. Fenagy’s systems only use the natural refrigerants CO2 and hydrocarbons, and with these, they cover a broad range of applications.

Fenagy is an OEM, but also a project-oriented company that secures professional and close cooperation with their partners.

Work with Fenagy

Tell us about your project. We'll route the conversation to the right team.

Get in touch
09
Case studies

Projects in depth.

Copenhagen · 2024

HOFOR Sets Benchmark for Decarbonized District Heating and Cooling with Integrated CO2 Heat Pump Project

Read the case study

Finland · 2025

Turning Data Center Waste Heat Into District Heating

Read the case study

Become ATMO Approved

Does your company use natural refrigerants?

The ATMO Approved label is independently verified. Not self-declared, not marketing. If your equipment runs on CO₂, ammonia, hydrocarbons, or water, you may qualify.

Apply for the labelLearn how the process works