Guideline for Investment in Building Enclosure Retrofit to Improve Home Energy Efficiency Based on Thailand Energy and Environmental Assessment Method

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Jaruwan Sukseeda
Daranee Jareemit


This study analyzes the payback periods of building enclosure retrofits related to energy saving score obtained from Thailand Energy and Environmental Assessment rating system. The retrofit methods focus on replacing high performance windows, installing wall and roof insulations with 54 detached houses. The cooling electricity consumptions are performed using eQUEST 3.64 and the returns gained from the envelope retrofits are calculated using the simple payback period method. It is found that improving high performance window could significantly reduce the cooling electricity consumption followed by adding the wall and roof insulations, respectively. Within 20 year payback periods, the average electricity saving after retrofitting is 30 percent. Lastly, the most effective envelope retrofits, considering financial investment as well as energy saving score, are proposed. The studies’ results could help homeowners decide and select those techniques to improve their home envelope for energy efficiency.


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