We studied the actual condition and problems of energy conservation refurbishment projects utilizing the national subsidy system by questionnaire survey and interviews. One of the features of this study is to have grasped the actual condition about frame refurbishment of non-residence buildings with few repair examples. The refurbishment projects are implemented together with replacement of the existing equipment in many cases. And most of them are partial frame refurbishment. One of the subjects both the building owner and the construction builder pointed out was that the unclear cost-effectiveness of frame refurbishment.
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