In Europe, research has the objective to produce guidelines for building refurbishment of modern heritage. In particular, theissue of energetic improvement is analysed according to characteristics of existing heritage and local climate. In fact, it ispossible to observe that, locally, building production after World War II is composed of common building types built withrecurrent constructive techniques and technological solutions. Based on this, a research has been initiated with the objectiveto identify procedures and the sequence of actions to be applied for rehabilitation of modern heritage buildings throughoutthe Italian territory. This paper reports first results of the assessment of the energy requirement for cooling and heating, fordifferent interventions on the envelope, for a very common building type in the existing modern heritage buildings inEastern Sicily