Responsibility for the future

We at ONI will always strive to develop system solutions for our customers which need less energy, in order to counteract the expected increase in energy costs. We are sure that, together, we can make an important contribution to our society. To us, the environment and energy efficiency are our main focus and, as such, we believe that economy and ecology are not contradictory.

ONI´s philosophy


World market leader

ONI was founded in the early 80s and has been a success story for over four decades. Starting as a small garage company, ONI has grown to over 485 employees and has received worldwide recognition and awards for its energy-saving system solutions, but also for its corporate performance. Today, more than 6,000 customers in over 70 countries around the world, from medium-sized companies to global corporations, rely on ONI's energy-saving technology.

ONI´s history

Working at ONI

"Our success is the result of an outstanding team performance and a range of products and services that is optimally tailored to the needs of the market. We are a strong team and only with a strong team are we able to continuously drive our dynamic growth forward and secure jobs in the long run. For this reason, our employees are equally important as our customers". (Wolfgang Oehm, company founder and managing partner)

Jobs at ONI



With future-oriented system solutions, we have developed into an industry leading company. Our energy-saving and high-quality system solutions are used today by medium-sized companies and global corporations alike. The product spectrum ranges from cooling system technology to heat recovery, air conditioning, ventilation, clean room technology, compressed air supply and machine optimization. Our customers get everything, from a single unit up to a turn-key system for a whole factory site from one source.

ONI's range of services


Our Goal: Sustainability

A first class service, even after delivery of a system, is a basic requirement for the success of a company. Therefore, our main focus is offering a reliable service, which has definitely played a decisive role in our success. Our customers all over the world expect a full-service. Through our global data information system, we can monitor all ONI units around the world in real time.

ONI´s certificates



ONI has production facilities in Germany and China. Since its foundation in the early 1980s, the company's headquarters has been located in Lindlar (NRW) and is continuously expanding. ONI Temperiertechnik Rhytemper is based in Großröhrsdorf (close to Dresden). There is a permanent need for expansion here as well. ONI Energy Saving Technology Co., Ltd. started in 2017 in Kunshan, China. Sales, production and assembly for the Asian Pacific Region are carried out from Kunshan.

ONI´s locations

ONI: The Energy Optimizer

Our focus is on the plastics industry, metal processing, metal processing and refinement, food industry, medical technology, chemical industry and automotive suppliers. Together with our customers, we develop solutions based on ONI standards. The optimization of system technology in regards to energy saving and environmental protection is always our priority.

Articles about ONI


Reliability creates trust

Ensuring the satisfaction of our customers is a duty of every ONI employee. For this reason, the entire ONI team is happy when customers give us positive feedback, either for a very good performance in order processing, for a particularly positive operational experience using our energy-saving technology with outstanding savings or for offering assistance in the event of an emergency.

ONI´s references