In this study, the selection of PCMs has been done depending on their chemical nature and melting temperature. PCMs with a melting point close to the human comfort temperature have been used (aprox. 24ÂșC). Different experimental techniques have been used for the characterization of the used PCMs and for the characterization of the natural stone after treatment with the PCMs. The results have shown that these new products based on natural stone have the ability to store energy.