In summary, the multiple regression analysis shows the same
results as expected and could not provide new evidence. The collection of more independent variables like the detailed wall constructions, the installed lighting power or the annual hours of artificial lighting usage (installation of daylight sensors and presence detectors) will perhaps improve the results and also the percentage of variability explained above. The final regression model can help assess the energy consumption of a new school building in Luxembourg. For instance, a passive school building's thermal end energy consumption (x2 = x3 = x6 = 0) can be assessed
with a 95%-confidence interval at 24-65 kWh/(m2a), using the estimated regression parameters (see Table 3), which seems realistic