Don't feel bad. I also live in Japan, and in my experience most homes (mine included) still use gas boilers and kerosene heaters. Not to mention that houses are

Don't feel bad. I also live in Japan, and in my experience most homes (mine included) still use gas boilers and kerosene heaters. Not to mention that houses are built to be as cheap as possible, so insulation is almost non-existent and you boil in summer and freeze in winter.