This Home Is Built Into the Earth and Costs $0 to Heat. Why Is It Banned?

This house is buried inside a hill. No furnace. No heating bill. No moving parts. Just earth, glass, and physics that have worked for 10,000 years. From the Jomon pit houses of ancient Japan to the yaodong caves of China to the turf homes of Viking Iceland, every civilization that lasted long enough figured out the same thing: the ground holds a constant temperature year round. Build inside it and the earth heats and cools your home for free. So why does no modern building code acknowledge it? Why can't banks appraise it? Why does the construction industry pretend it doesn't exist? This is the full story of earth sheltered architecture. The history. The science. The reason it disappeared. And the people still building it anyway.