It's that time of the year when we look to simple ways on how to save money on heating during the winter: putting on some woolies, snuggling under thick blankets and maybe resorting to a few do-it-yourself hacks.

In South Korea last winter, however, with the shutdown of six of their 23 nuclear reactors translating to skyrocketing heating costs, not only did Koreans don their sweaters during the frigid cold to save money, but they also set up tents -- inside their homes.

According to Business Insider, the "massive blackouts and surging energy costs" from the closed reactors prompted huge retail sales of foot warmers, heating pads and panels during the winter months, in addition to millions of specially designed "indoor tents."