Case Studies examples

Länk till karta på Google Maps


  • “Hot Ice Weiz” is focused on the use of latent heat with two ice storages and two heat pumps in combination with unglazed solar collectors and a PV system. It is designed as a pilot project for local heat supply. (more)
  • Vögelebichl multi-family houses are the first in the world responding to the Passivhaus Plus Standard. Furthermore, the buildings were designed to achieve the annual net-zero energy balance thanks to on-site renewable energy generation. “Vöglebichl Multi-Family Passive Houses” are located in Innsbruck, Austria. (more)
  • The residential building “D12” is a block of 7 buildings with 4-6 storeys each, commercial use on the ground-floor (GF) with 8 shops on 900 m2 and 213 flats on the upper levels. The (conditioned) gross floor area is about 20,600 (19,080) m2. The building is located in Vienna/Aspern Seestadt. (more)

Denmark (more information soon)


  • A new built private housing is located in Marseille, in the South-East of France.  The hot water production is arranged by a solar heat pump. For this installation, climate and sunshine are very favorable. Thus, solar panels are installed on the building roof. (more)
  • The district heating system, specific to this eco-district in Roquebrune Cap Martin (Nice) is quite innovative. It is based on the treated water rejected by water treatment plant located 500m far from the ecodistrict. This water is used as the cold source of 8 heat pumps for DHW production and 5 heat pumps for heating and cooling. (more)
  • In Soissons, heating is supplied by a renovated district heating grid connected to a wood-fired heating plant. The DHW production was ensured by individual electric water heaters until now. The replacement of these by a collective heat pump induces a 50% reduction on the electric bill due to DHW production. (more)
  • Opened in mid 2018, a senior-living building in La Ciotat is another good example for heat pumps in civilian residential buildings. A 60m² solar panel is providing energy for the two heat pumps. (more)


  • Three apartments building in Turin. The project is focused on a hybrid design between solar thermal collectors, heat pump and a gas boiler. It is a renovation operation which successfully combine existing solar system with an in-series combination of gas boiler and air source heat pump.
  • Sixty apartments not retrofitted building in Turin. The project is focused on a hybrid design between an air source heat pump and two gas boilers. It is a renovation operation which successfully combine a gas boiler and air source heat pump in parallel in order to minimize the energy consumption especially during mid-season.


  • Over a net floor area of 3248 square meters a heat pump cascade system provides warm water, pleasant room temperatures and enough energy for the catering business on the ground floor of the new holiday home Boarding House Potsdam”. (more)
  • Between 1881 and 1966 children were taught inside this old school building in Kempen, which is now listed. In the meantime, the building served as a church, community administration and youth hostel. In 2008, the house was finally rebuilt by its new owner into a multi-family house with five residential units. After the existing building had been heated over the years with an oil heating and district heating, the decision was made to use a heat pump as an environmentally friendly solution. (more)
  • If former industrial and commercial areas are overbuilt, entire districts are often created in a very short time with a distinctive atmosphere and modern flair. This is also the case in the Düsseldorf district of Derendorf, where the discarded freight yard makes way for the “Neues Düsseldorfer Stadtquartier”, which heavily relies on heat pumps. (more)
  • Not infrequently, new buildings attach great importance to efficient insulation and environmentally friendly energy production. In Bruchköbel, the builder himself, with the help of his own construction company, has set himself the task of equipping his new building with advanced energy systems. (more)
  • Seven new buildings were built in Petershagen in northern Germany, each with a heat pump and photovoltaic systems on the roofs. Six of them contain apartments that are specially adapted to the needs of older people and the seventh is a community building. (more)
  • These two buildings form part of a cluster of five large renovated multi-family buildings from the 1960s within the Karlsruhe district Durlach, where an integrated energy system is demonstrated within the research project “Smart district Durlach”, Ersinger Street 2 and Ersinger Street 4.
  • In August of 2015 the five-storey multi-family residen- tial building (17 apartments) was commissioned. The all electric building is equipped with a 50 kWth electric brine-water heat pump that uses a total of 85 m2 of solar absorber in addition to an ice storage as heat source. The“nZEB multi-family houses” are located in Riedberg, Germany. (more)

Netherlands (more information soon)

  • “Second Skin” – community of Vlaardingen (Rotterdam)
    In 2017, 12 portico houses have been renovated according to the 2ndSKIN concept into “Zero Energy”-houses. The portico houses originally date from 1952 and have been thoroughly renovated including three-layer insulating glass. The new façade has an extra shaft for the two central heat pumps (each one separate for 6 apartments) and associated pipework. The source for each heat pump is a vertical GSHX (BTES) of 175 m deep.
  • “Jacques Urlus Plantsoen” – city of Leiden
    In this project two MFBs of 200 apartments each and an elderly care centre (all non-renovated buildings) in 2018 were equipped with a high temperature HP of 1500 kWth to replace the existing CHP gas engine and gas boilers. The HP can deliver 85 °C peak supply during wintertime for space heating based on an ATES system. In autumn and spring outside air is used as HP source. DHW is also provided by the HP on a temperature of 65 °C.
  • “Sculptures” – city of Breda
    The Sculptures complex was delivered in 2012 and consists of a total of 283 apartments, including 245 regular apartments and 35 care apartments. There is also 3,500 m2 of common care, including 4 psycho-geriatric departments. The base load of space heating is delivered by a water-to-water HP of 300 kWth with ATES as source. DHW is produced by 200 m2 of thermal solar collectors and HE gas boilers. These gas boilers also deliver the peak load for space heating. Free cooling during summertime is delivered by the ATES system. The houses and the care departments have underfloor heating.
  • “Hoog Lindoduin” – community of Scheveningen (The Hague)
    The deep renovation of this 14-story building with 182 apartments was finalised in 2021, almost 60 years after its original construction. In the renovated building each apartment has its own HP which delivers space heating and DHW. The source is a collective BTES system consisting of 60 GSHXs of 250 m each providing free cooling during summertime.
  • “Sophia Staete” – community of Hendrik Ido Ambacht
    Sophia Staete is a new residential care building delivered in 2013 of approx. 13,000 m2. Two central HPs deliver 35 °C supply for space heating and source energy for 74 separate DHW-booster-HPs in each apartment. The central HPs use ATES as source system, which is regenerated by low temperature thermal solar collectors (Energyroof)
  • “Leyhoeve” – city of Tilburg
    The Leyhoeve complex was delivered in 2016 and consists of 285 care apartments. The apartments are spread over six floors and have a total gross floor area of 39,650 m². 3 variable speed piston HPs of 200 kWth each with BTES as source system produce heating and cooling. DHW of 72 °C is delivered by 3 high temperature HPs of 100 kW each (also variable speed piston types) which use condenser heat of the BTES HPs as source.


  • The project in Daru, Geneva concerns the replacement of an existing gas heating system by a hybrid HP+gas solution in an existing multifamily building. With the goal of having the maximum annual heat production from HP origin, six air/water heat pumps were implemented on the rooftop. (more)
  • The project in St. Julien, Geneva concerns the replacement of an existing oil heating system by a HP only solution in a multifamily building. With the goal of having the total heat production from HP origin, two air/water heat pumps were implemented on the rooftop. One of the previous fuel oil boilers was kept for back up. (more)
  • In Zurich, three heat pumps were built on top of an living unit from 1982 in 2016. The whole construction was also completely revemped by adding new floors, windows, insulation, solar panels and air conditioning. (more information soon)
  • Another older example from Zurich is a multi-family housing scheme, which was built in 1928 and modernized in 2001. The new heat pump is able to provide all required hot water at least in the summer months. (more information soon)
  • In Bern, an old oil heater was replaced by a new heat pump. Although the heat pump is not directly located at the building, it is still possible to transport the heat into the apartments by a pipe system. (more information soon)
  • Three connected buildings from 1963 were renovated in 2013. The workers improved the insulation, canged the windows and added two heat pumps. The solar panels on the roof are able to provide 148% of the required energy for the 18 households. The construction is also located in Bern. (more information soon)
  • The first MINERGIE-A® building with office use in canton ZH, located in Uster, has been monitored for two years from May 2014 – April 2016. The all-electric building is equipped with a 33.1 kW ground-source heat pump (B0/W35) a 24 kWp solar PV-system and a 7.1 m2 PV/T-collector for domestic hot water (DHW) preheating. (more)
  • The multi-family house has four apartments and is equipped with a geothermal heat pump with two bore- holes of 225 m each for space heating and DHW production. The multi-family plus energy building Allmendholz is located in Horgen, Switzerland. (more)

UK (more information soon)