When an energy rehabilitation of a building is planned, the aim is to achieve a significant energy saving. However, how to assess these savings can be difficult. A first idea may be monitoring the building before and after rehabilitation, but the climatic conditions can differ, which may mislead the conclusions. In this work, this problem was avoided by monitoring two similar buildings for a year, one of them energy retrofitted and the other not, sited in the same location (Zaragoza, Spain) and also with the same orientation and geometry, same climate, inner conditions as similar as possible but different materials in the enclosures: rehabilitated and original. This accurately compares energy consumption between the rehabilitated building and the non-renovated building. The yearly energy savings achieved were 58.42 % with the rehabilitation.
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