After the research work done it can be concluded that based on the climatic **data** (especially the annual WB temperatures) of different cities of the Baltic region a 23°C PCM melting point is suitable for use in systems that utilise adiabatic cooling principles for high temperature cooling and regenerating PCM layers that are enclosed in building structures. This PCM melting point temperature is consistent with temperatures reported in other studies [11]. In a typical climate in Riga (Latvia) and adiabatic cooling system would be able to reach supply temperature below 19°C for around 8450 hours a year leaving only a period of around 300 hours where the supply water temperature cannot be met with passive means.