Temperature and enthalpy of phase changes taking place in PCM (Phase Change Material)-modified plasters within their heating and cooling exposure are studied in the paper. The studied plasters are composed of hydrated lime, pozzolan admixture, silica sand, water, and encapsulated parrafinic wax that is used as PCM. The studied materials are characterized by bulk density, matrix density, and total open porosity. The temperature of phase changes, heat of fusion and crystallization are evaluated by DSC (Difference Scanning Calorimetry) analysis that is performed in inert nitrogen atmosphere. Experimental data reveal a substantial improvement of heat storage capacity of PCM-modified plasters as compared to the reference material without PCM.