The Netherlands is in de midst of an energy transition, 7 million households and 1 million buildings that are currently poorly insulated and heated by natural gas must be transformed into well-insulated buildings and heated with a sustainable heat source. The government encourages homeowners to make their home more sustainable by providing subsidies for insulation and sustainable heating technologies such as heat pumps. Heat pump manufacturers are seizing their opportunity by developing online heat pump decision-making tools that allow homeowners to check whether their home is already suitable for a sustainable heat pump system, said they do this mainly out of their own interest to sell more heat pumps. In addition, there are also independent organizations that develop online heat pump decision making tools, they do this more out of interest for the climate. But it’s not clear whether these tools provide all the information and advice a homeowner needs before engaging an installer to install a heat pump system. In addition, it is not clear whether existing tools provide right advice to support the energy transition. Therefore existing online tools are analysed and reflected on through literature and additional research in order to develop a better tool. Therefore the main research question in this thesis is:

How is a heat pump decision tool for homeowners with limited technological knowledge designed, which gives an advice that contributes to the energy transition of the built environment and which provides an advice on which heat pump system and additional measures a homeowner should consider before engaging an installer?

First a literature study is conducted into the energy problems related to space heating in the Dutch built environment. Possible sustainable sources and heat pump systems with a high contribution to the energy transition are defined. These sources and systems are then included in the newly designed heat pump decision making tool.

Existing online heat pump decision making tools are then analysed in order to function as a basis to define all aspects a homeowner should consider before purchasing a heat pump system. A review is made on the basis of the literature study carried out earlier in which areas the advice of the existing tools is lacking. These shortcomings are addressed in the new tool.

Thirdly based on an example home, it is investigated which measures during an energy renovation that a home ultimately uses less energy, emits less CO2, is heated sustainably and has an higher indoor comfort. These findings are included in the new tool.

The new heat pump decision making tool is then developed on the basis of flow diagrams. All decision moments are based on the findings from the various conducted studies. These flowcharts are eventually converted into a digital online heat pump decision making tool. With this new tool, the homeowner is provided with all the necessary research-based information before engaging an installer to purchase a heat pump system. This assures the homeowner of correct advice without the involvement of an installer, which leads to a major contribution to the energy transition, better indoor comfort and lower heating costs.

Overall it can be concluded that: insulating the home first as described in the tool (minimum label B according to the insulation standard) leads to the highest contribution to the energy transition and a higher indoor comfort. And that the choice of the heat pump systems depends on the home-specific aspects, and the wishes of the homeowner.