Interventions on frames, shown in Fig. 10, are less profitable because of the high cost of these technologies, although they can be implemented without additional costs (scaffolding, finishing, etc.). For this kind of intervention, there is much more convenience in historical building, where the frames are less efficient and in bad conditions, benefiting from a greater reduction in terms of trans- mittance value. In fact, in this case, the possibility to transform is defined as much higher than the case of opaque external wall