Green retrofit of existing residential buildings in China: An investigation on residents' perceptions

Green retrofit of existing residential buildings is a sustainable way to improve the energy efficiency. However, such implementation faces some challenges due to the different willingness of residents involved. There is a lack of comparative study on residents' preceptions of green retrofit in China, which is of great concern to the government. Therefore, this study investigates residents' housing conditions and their perceptions of a green retrofit, based on the feedbacks from 9936 questionnaires which are collected from urban and rural residents throughout China. The Chi-squared test is employed to identify the key influencing factors, including demographic and housing characteristics. The results show that more than 90% of the respondents are willing to adopt retrofit, and installing a zoned temperature control system of individual rooms is a generally acceptable measure. The retrofit subsidy is a topic of high concern, and the respondents are more likely to undertake unified free retrofit, compared with separate retrofit supported by a partial subsidy. Besides, household income, city of residence, housing type and housing problems will cause significant differences in residents' perceptions. After evaluating the retrofit potential of different resident groups, some suggestions are proposed for policymakers. The findings from this study can help develop differentiated strategies for residents, to promote green retrofit of existing residential buildings in China.