This Annex will focus on heat pump ́s solutions for multi-family housesin high-densitycities.In respect to the demand of the participating countriesnew buildings and retrofit will be considered,as well as buildingswith higher specific heating demand.


There is no doubt about the dramatical situation of the climate change. There is also no doubt about the necessity to act decisively to reduce the future impact of the climate change by reducing the emission of greenhouse gases.

One of the significant sources of CO2 emissions amplifying the negative climate changes are the heating and cooling needs of people living in buildings. A major solution preventing CO2 emissions in the heating and cooling sector is to use heat pumps instead of technologies based on fossil fuels. Heat pumps are already today the number one technology in new, typically single-family houses, in particular in Europe. This trend must continue and further evolve.

As regards multi-family buildings, there exist good examples of heat pumps implementation, however, it is not yet a widely chosen solution, neither in new, nor in existing buildings. At the same time, there is an ongoing trend for a migration to high-density cities and, consequently, the significance of multi-family houses is on the raise.

The “Net Zero by 2050, A Roadmap for the Global Energy Sector” from IEA published in Spring 2021 shows very clearly: to reach the ambitious and in some time necessary CO2 reducing goals by 2050, 50% of heating demand must be met globally by heat pumps in 2045 at the latest. To make it possible, short-term actions are required to find the best solutions for heat pumps implementation in all types of buildings, most importantly, there is a pressing need to search for and to provide optimal solutions for heat pumps implementation in high-density cities, with the focus on new and existing multi-family buildings.

The new Annex should clearly base on the results achieved in the Annex 50 “Heat Pumps in Multi-Family Buildings for Space Heating and DHW” and be a continuation of work initiated by the Annex 50 group. In addition to other sources, the work from other Annexes should obviously be taken into account. For example, the Annex 49 “Design and integration of heat pumps for nZEB” and Annex 46 “Domestic Hot Water Heat Pumps” should particularly be considered.

Contact Person

Mr Marek Miara, marek.miara@ise.fraunhofer.de

Participating Countries

France, Germany


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