This work proposes the improvement of the energy performance of hollow concrete floor panel through the insertion of a phase change material (PCM) in enclosures of the floor panel in order to significantly increase the thermal inertia of the wall. The PCM is a shape-stabilized polymer composite PCM containing 85% of paraffin, with a latent heat of melting of 110 kJ/kg and a melting point at about 27 degrees C. This article shows first, the design and development of the floor panel including PCM, then presents the methodology of the experimental tests that were conducted to study the thermal performance of the floor panel. The obtained results were discussed and finally the most relevant conclusions are presented, as well as future basis of the investigation. (C) 2013 Elsevier B.V. All rights reserved.