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Passive Annual Heat Storage,
Improving the Design of
Earth Shelters (ebook)

Get the 1st chapter free

How to design a home with a
BUILT-IN COMFORTABLE TEMPERATURE

The ultimate in energy conservation.

Collect summer sunshine by cooling the house naturally, then restore that heat to keep it cozy and warm all winter.

Natural convective-powered ventillation system, brings in warm air in the winter and cool air in the summer.

No machinery or commercial energy needed. It's all natural.

2005 ebook up-date of the 1985 classic PAHS book, complete with 103 color illustrations.

More Information from the PAHS Education Page

by Prof. John N. Hait
160 pages, fully color-illustrated, e-book
2004 E-book Edition.
Price = $49.95 USD

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