Stock Housing and Utilities Under Hot and Cold Weather

In Japan, extensive consideration is given to utilising ageing housing complexes as part of the housing stock. However, when renovating old buildings, some prioritise costs but neglect energy consumption. While insulation retrofitting is a highly effective measure, it often becomes unaffordable due to competing priorities, such as design improvements and ensuring airtightness. To date, there has been little academic analysis of the costs and energy conservation benefits of retrofitting existing housing stock. This study aims to analyse the cost and energy efficiency of ageing housing complexes, such as apartment buildings. The evaluation focuses on the cost and energy consumption of an old apartment building, with findings showing that ceiling insulation has a significant impact. The collected data is presented in numerical form, providing practical results for designers to utilise in their projects. This project is a valuable resource because it is a database for preventing heat shock in vintage and ageing homes. Furthermore, since heat load is energy, it is important to improve insulation capacity to reduce energy consumption. However, this is difficult due to the cost. Although cost evaluation is important, we must focus on the importance of insulation retrofitting to ensure the prosperity of school buildings and the well-being of children, the elderly, and young people under national policy. Therefore, I hope the conclusions of this paper will serve as a reference for design practitioners and that other researchers will pay attention to this type of steady research.