Maintaining indoor condition is an important factor for controlling electric appliances in living space. Generally speaking, a sense of feeling indoor condition is variable between residents. The conventional methods were dealing with this by supposing general residential. This means the conventional methods cannot consider all the residents. This is not realistic when considering installation of the system into the real environment. Thus, in this study, the Bayes' estimation was utilized to analyze the amenity variability. As a result of analysis, the new index, satisfaction rating index, was proposed. To achieve this, the HEMS was constructed in the actual operating residence. As a result, the analysis was acquired from 14 people from 3 different residences. To confirm the availability of the proposed index, the home appliance control system utilizing satisfaction rating index was conducted. The proposed system was evaluated by the experiment in the actual operating residence. From the result, the evaluation showed the availability of the proposed system and satisfaction rating index.