Demand for higher thermal comfort and climate changes have brought new challenges for designers of cooling systems, because of increased usage of air conditioning in building environment, resulting in higher electricity demand and CO2 emissions. Today the thermal energy storage plays an important role in building energy conservation, which can be achieved by the incorporation of PCM into building envelope. PCM incorporated in plaster absorb redundant heat, which leads to improved thermal inertia of the building, lower and shifted in time temperature peaks. Thus increasing thermal comfort, reducing load of HVAC systems and electric energy consumption. References have been found for improving the thermal properties of concrete and plasters containing PCM.