. Model refinement
Given the huge variety in building stock in the city it is not surprising that the matching procedure failed to always match real properties with EHS data. In addition certain aspects of the modelling process cannot be automated in this way due to the nature of the property or special cases of the heating systems used. This section describes the key forms of empirical model refinement that were carried out on the data. In our results we report on their significance. Table 2 shows the number of adjustments made in each of our study areas.