Due to climate change and increasing frequency of heat waves, cooling in residential buildings gains importance. The most common way of cooling in buildings is active cooling with the use of split units or central air-conditioning systems, using an electric compressor and standard refrigerant. However, these systems have a relative high energy consumption, and the European parliament has called a phasedown for many of the refrigerants. Sustainable cooling systems can therefore be a superior alternative for conventional systems. These systems are however not often applied due to a lack of real performance data and guidelines for the correct selection and dimensioning. This problem is addressed by the CORNET SCoolS.