The majority of present-day dwelling houses were constructed in the previous century, when energy efficiency was not as important as now. Therefore, there is a necessity to assess existing dwelling houses and refurbish them to satisfy energy efficient requirement and humans’ needs. To cover the first part, authors of this paper continue their discussion on optimal leaving place started previously. In this paper based on concepts “passive house” and “active house”, standards of European Union (EU) and Lithuania, the concept “optimal environment” is refined and defined. According to the presented concept of optimal environment, the MADM-opt method, which is based on the concept of optimal alternative, is refined in the paper also. It is applied for the WASPAS method to assess an indoor environment of six apartments in similar brick houses. The results show that MADM-opt can be used for the assessment of alternatives and their evaluation according to the optimal alternative. Moreover, it allows determining deviation of the assessed alternatives from the optimal alternative.
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