The primary and pre-school buildings are similar with respect to the nature of their use and represent the second largest group of educational buildings. In a study [5] conducted by the Ministry of Education in 2008/2009, there was a total of 452 school buildings falling into this category in Luxembourg. Based on information received from the relevant municipalities in Luxembourg, 91 of these buildings can be classified as new objects (year of construction after 1996). Of these 91 school buildings we analyzed the energy consumption of 52 buildings in this study. These represented 55% of the population and consequently provided a representative sample.