Which of the following is a requirement for energy efficiency in Japanese residential buildings

Which of the following is a requirement for energy efficiency in Japanese residential buildings

Which of the following is a requirement for energy efficiency in Japanese residential buildings, as per the Energy Conservation Act?

A. Use of solar panels for electricity generation

B. Minimum insulation thickness for exterior walls of 50 mm

C. Use of double-glazed windows

D. Natural ventilation in all living rooms

E. Energy-efficient lighting systems

Answer: B

Explanation: Japan’s Energy Conservation Act mandates minimum energy efficiency standards for buildings. For residential buildings, the exterior walls must have a minimum insulation thickness of 50 mm (depending on the region) to reduce heating and cooling energy consumption—this is a key energy efficiency