FAHRENHEIT: Cooling Innovation.

FAHRENHEIT is the market and technology leader in the field of adsorption cooling.

This innovative technology has become the new standard in a wide range of applications for economical, energy-efficient, and environmentally friendly cooling. We originated in 2002 as a spin-off of the Fraunhofer Institute for Solar Energy Systems (ISE). At that time, under the name SorTech AG, we pushed the pioneering concept of adsorption cooling to market maturity—and developed high-performing product solutions for a wide variety of applications and requirements.



In terms of energy efficiency, cooling technology has made notable progress in recent decades. But one problem has not been solved in conventional compression cooling so far: it requires synthetic refrigerants—and these substances significantly contribute to global warming. The FAHRENHEIT cooling solutions represent a milestone on the way to sustainable and climate-friendly cooling. Using adsorption technology, the energy required for cooling can not only be reduced by up to 80%: As refrigerant, we use only pure water. And our adsorbent materials, zeolite and silica gel, are non-toxic and environmentally harmless.


Matthias Hoene


"FAHRENHEIT is, on the one hand, a fascinating high-tech company and, on the other hand, an enterprise whose success makes an important contribution to the protection of our resources. What motivates me and us is to always push the state of the art through intelligent solutions, and at the same time, to achieve something meaningful and sustainable. Re-using heat provides huge energy and cost saving potential. Every day, we strive to reap this potential—ultimately for the benefit of us all."

Matthias Hoene has been leading FAHRENHEIT since 2017. He started his career as a software developer at Trilogy Software in Austin, Texas, and went on to become a project manager with BMW in their logistics division. He then joined McKinsey as a consultant to automotive, high-tech, and healthcare clients. In 2010, Matthias Hoene co-founded ZebraMobil GmbH in Munich, the first free-floating car sharing operator in a major city. After selling the car sharing operations of ZebraMobil, he returned to McKinsey to run Horizon360, an internal startup which offers data and standard tools to help with IT and Digital transformations.

Matthias Hoene graduated from ETH Zurich with a degree in Industrial Management and Production Engineering, and holds an undergraduate diploma in Mechanical Engineering.

Steffen Kühnert

Technical DIrector

"In view of rising energy prices and political demands for technologies with a low global warming potential, the cooling industry must meet new challenges. The development of environmentally friendly and climate-neutral solutions, and the optimization of existing systems, have been our core business at Fahrenheit for many years. Fahrenheit GmbH is an innovative, cool employer, and keeps on offering new and exciting development challenges."

Steffen Kühnert is Technical Director at FAHRENHEIT. He joined the company in 2007 as development engineer. From then, he took on responsibility for both product development and manufacturing. Prior to joining FAHRENHEIT, Steffen Kühnert had been working for engineering companies. He started his career by serving seven years in the German armed forces.

Steffen Kühnert completed an apprenticeship as a cutting machine operator and holds a diploma in Mechanical Engineering.

Dr. Ralph Herrmann

Head of Research & Development

"Environmentally friendly adsorption processes make most sense if they are supported by a resource-friendly use of materials. When used correctly, readily available and non-toxic adsorbent substances can provide the best cooling or heating performance even in small quantities. At Fahrenheit, we recognized this early on, and developed the technology to grow zeolites directly and in precisely defined layers on optimally designed components. Interesting follow-on questions, and the innovative climate at Fahrenheit, have since led to many other innovations."

Dr. Ralph Herrmann is in charge of research and development at FAHRENHEIT. Trained as a chemist, Dr. Herrmann dedicated a large part of his professional life to researching and evolving zeolite crystals. He holds numerous patents in this field. Since 2004, he has been applying his expertise at FAHRENHEIT.

Before joining FAHRENHEIT, Dr. Herrmann obtained his Ph.D. from the University of Halle, and spent several years at the University of Erlangen as a researcher and as a lecturer for chemical engineers.

Gregor Feig

Head of Sales

"All our customers have different requirements, needs, and challenges regarding their companies, buildings, and processes. What they share is the desire to implement sustainable and effective cooling solutions. Finding the most sensible approach, and balacing the right levels of ecology and economy together with our customers, is an exciting process in which we constantly get to know interesting people and new industries."

Gregor Feig is in charge of sales for adsorption chillers. Mr. Feig, who is originally an architect, first joined our company in 2011 as Sales Manager for Southern Germany. In the meantime, he served a stint as Sales Manager for a maker of digital building models and simulations. Prior to joining FAHRENHEIT, he has worked in various sales functions, including in his own business. He started his career as a planner in engineering companies.

Gregor Feig completed his architectural studies at the University for Applied Sciences in Regensburg.

FAHRENHEIT: A history of innovation


Each time we feel our customers’ enthusiasm for sustainable cooling solutions, we consider that enough of a reward. But the experts also see the enormous potential of our cooling technology. Find here a brief overview of the most important prizes we received in recent years. We strive to add many others.