Nowadays, the use of phase-changing materials (PCM) which store energy as latent heat in the thermal mass and provide energy saving by increased thermal mass of building envelope is becoming more and more common in buildings. However, in literature, the number of theoretical, practical and experimental study on using in building envelope of these materials is not enough and lack of information in relation to this topic effects results of similar studies. With this study, it is aimed to examine the phase-changing materials that have just started to be used in the building envelope in different categories through thesis, articles, books, and research projects made in recent years and to shed light on the agenda by means of present a summary of the literature on PCM to the reader in result of these examinations. In line with these targets; approximately 50 scientific studies published in recent years; Usage in different climatic regions of building envelopes with PCM, the building element where the PCM is used, the PCM types used, the joining techniques with PCM, the study type and the simulation program used are evaluated and expressed with tables and visuals. By comparing the thermal performance characteristics, advantages-disadvantages and application methods of different types of PCMs, the necessary suggestions were made and the process that should be followed by the researchers who will work on this subject is shown on a diagram. As a result of the study, although there are many studies on PCMs, it was determined that the engineering knowledge on this subject is insufficient, the number of experimental studies should be increased, and most importantly, it is of great importance to develop PCMs as a low-cost and sustainable material suitable for use in building envelopes in all climatic conditions. It has been stated.

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