This House Is a Giant Greenhouse That Grows Its Own Heat. Why Did They Ban It?

Invented during the passive solar movement of the 1940s, these homes use a central "sun-space" to heat the entire structure via natural convection loops. It is "gatekept" by "Habitable Space" and "Fire Wall" regulations. Building codes often classify a central greenhouse as a "non-living" area, but require it to be separated by expensive fire-rated doors and glass, which blocks the heat flow. This "ban" is supported by Large-Scale Window Manufacturers who want you to buy dozens of small, expensive "high-E" windows instead of one large, DIY-friendly solar collection wall.