After the calculation, the LCI evaluation level division is further derived as shown in Table 4. the LCI is less than 3, indicating the urgent need for the low carbon evaluation index system to identify its own shortcomings and prioritize the optimization of the indexes with higher weight values in order to improve its low carbon performance under limited conditions. Meanwhile, due to the poor condition of existing rural residential buildings, their renovation work is relatively large. For buildings with LCI in [3, 4), the low-carbon evaluation situation is medium, and the buildings can be retrofitted according to different criteria, giving priority to indicators with good low-carbon performance. buildings with LCI in the range of [4, 5] can temporarily not be retrofitted because of good conditions in all aspects. buildings with LCI of high or medium carbon type, this paper hopes that through retrofitting, the LCI can reach a score of 4 or higher to achieve their low-carbon Transformation.
Table 4 Classification of evaluation levels