About us

The IZW e.V. stands for the neutral and professionally communication of information in the Refrigeration and heat pump technology. The IZW is not a competitor to other organisations and associations in industry and trade, but your potential service provider. The recent strong increase in sales figures for heating pumps in the small residential building sector confirm the success of the diverse activities of the IZW.

An important task of the IZW e. V. is the coordination of research programs to optimize components, plants and systems.

The focus is on the economical and energy-efficient use of heat pumps in the renovation of old buildings, the area of application with by far the greatest potential for savings in primary energy and the reduction of CO2 emissions.

In cooperation with the Energy Project Management Agency at Forschungszentrum Jülich, the following international projects (called “annexes”) were coordinated as part of the heat pump program (IEA Heat Pumping Technology) of the International Energy Agency (IEA):

  • Retrofit Heat Pumps for Buildings
    Participants: Germany, France, the Netherlands and Sweden
  • Application of Industrial Heat Pumps
    Participants: Denmark, Germany, France, Japan, Canada, Austria, the Netherlands, Sweden and South Korea.
  • Industrial Heat Pumps, Second Phase
    Participants: Denmark, Germany, France, Japan, Austria Switzerland.

Further examples of the neutral technical information provided by the IZW are

  • Information about the development of the European F-Gas Regulation and
  • Contributions to the national hydrogen strategy.


After the oil price crisis in the early 1970s, the “International Energy Agency” (IEA) was founded in 1974 as part of the “Organization for Economic Cooperation and Development” (OECD) with the aim of introducing an international energy program.

In 1982, the IEA passed the “Implementing Agreement for a Program of Research and Development on Advanced Heat Pump Systems”. An annex in this program was and still is the “Heat Pump Center” (HPC), which ensures an international exchange of information on this topic.

  • Until the end of 1989, the first operator (“operating agent”) was the specialist information center in Karlsruhe, a society for scientific and technical information.
  • From 1990 to 2003 the operating agent was the Netherlands Agency for Energy and Environment (NOVEM) in Sittard.
  • The SP Technical Research Institute of Sweden (new company name from 2019: RISE (Research Institutes of Sweden)) in Boras has been the operating agent since 2004.

Since January 1st, 1990, the project “Information Center for Heat Pumps and Refrigeration Technology” (IZW) funded by the Federal Ministry for Research and Technology (BMFT) has been in operation for the consistent continuation of the activities of the HPC in Germany within the Specialist Information Center in Karlsruhe.

His work was supported by the professional competence of an advisory group consisting of experts from the heat pump, refrigeration and air conditioning sectors as well as energy supply. After more than nine years, the project ended on March 31, 1999.

In order to be able to continue the successful work, the registered association “Information Center Heat Pumps and Refrigeration Technology”, IZW e. V. founded in Hanover. The long-term funding by the BMFT was gradually reduced and finally stopped in 2002. Since then, the society “IZW e.V.” has been financially supported solely by its members from industry, organisations and associations as well as individuals.

The diverse tasks are managed by the honorary board, an existing network (national and international), a small group of consultants and assistants. Due to the good cooperation with all organizations active in the field of heat pump and refrigeration technology, the IZW has a broad information base and diverse opportunities for cooperation nationally, in Europe, also in the USA and Japan.


of the society are the promotion of research and development for the use of heat pump and cooling technology as a contribution to reducing primary energy consumption and CO2 emissions, improving energy efficiency and environmental protection in heating and cooling generation. This results in the following tasks, among others:

Neutral information transfer in heat pump and refrigeration technology through status reports, technical and scientific events and other publications
Implementation of the results of energy and environmental studies in generally understandable, but scientifically and technically status reports.
Supporting political opinion-forming through objective information and reports.
Recommendations for realistic framework conditions to support the funding programs of the federal government, the states and energy supply companies.
Analysis of the medium to long-term possible uses of heat pump technology for the provision. of heating and process heat.
Coordination of research and development programs, for example following the successful Annex 30 (heat pumps in existing buildings), currently the coordination of Annex 35/13 (application of heat pumps in industry) and Annex 48 (industrial heat pumps, second phase).
Implementation and support of seminars, workshops, information events on current topics and problems of heat pump and refrigeration technology.
Publications such as "IZW informs", status and research reports, publications, information brochures ...
In national cooperation, the IZW would like to be a link to the refrigeration, air conditioning and heat pump industry and their associations and the German Refrigeration and Air Conditioning Association e. v. be For example, it is also involved in the development of VDI guidelines.
IZW is a member of the "National Team" for Germany in Heat Pumping Technologies (HPT) of the International Energy Agency (IEA).

Membership in the IZW e.V.

Companies, research institutes, organisations, natural and legal persons who want to promote heat pump technology can become full and extraordinary members.

The annual fee depends on the type of membership.

On request, we will be happy to send you further information (including the contribution regulations and the statutes) as well as an application for membership from the association.

Contact usgo to Member Area

Organization of the association


Dipl.-Ing. Volker Weinmann

Vice Chairman

Dipl.-Ing. Jürgen Süß


Dipl.-Ing. (FH) Michael Hendriks

Office North

Dipl.-Ing. Carmen Stadtländer
Postfach 3007, 30030 Hannover

Office South

Dr.-Ing. Rainer M. Jakobs
Kreuzfeldstraße 10, 64747 Breuberg