1. Energy White Paper 2020, Agency for Natural Resources and Energy, June 2020, Part II, pp. 112- 115, https://www.enecho.meti.go.jp/about/whitepaper/2020pdf/whitepaper2020pdf_2_1.pdf. (in Japanese).
2. Study on state of COP and regional characteristics of APF for room air conditioners;Shinichi;AIJ J. Technol. Des.,2014
3. https://www.iea.org/news/air-conditioning-use-emerges-as-one-of-the-key-drivers-of-global-electricity-demand-growth (last accessed on 13/05/2022).
4. Japanese Standards Association Committee: Package air conditioner JIS B 8616:2015, (2015). (In Japanese).
5. Japanese Industrial Standards Committee: Room Air Conditioners; JIS C9612: 2018. (2018). (In Japanese).