3 suppressed systems that eliminate your heating bill. Forever.
And why they remain illegal to build in most US states.
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This is not a design guide. It is a documentation file: the math, the suppression history, and the retrofit sequence nobody puts in the product brochure.
Primary sources cited
Every technique in this PDF was banned, suppressed, or buried by an administrative decision that had nothing to do with structural safety and everything to do with who profits from the materials you are currently required to use.
The retrofit sequence at the end tells you which system returns the fastest ROI, which one requires a permit fight, and which one you can start this weekend with no contractor and no inspection.
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