The school building is the first contact between a person and a public building and it is also a demanding space regarding the comfort levels. Public educational buildings require a high level of indoor comfort conditions to be achieved for their users. The vast majority of educational buildings in Cyprus consist of typical typologies and construction characteristics. The designs show significant similarities, extensive standardization of building components and construction methods and a reliance on previously tested building models. The intent of this paper is to investigate the energy performance of a typical classroom, as well as to evaluate various methods for improving energy performance, based on construction interventions.