Has anyone ever read of, read about, used this method for "heating" a house.
Read at the following link. It has a great schematic drawing too.
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http://www.earthsongfarm.com/PAHS.html
What is it? ....
PAHS (Passive Annual Heat Storage) is an innovative, practical and simple technoloy of heat collection, storage and retrieval. The principle was developed by John Hait of the Rocky Mountain Research Center in 1983.
PAHS is essentially placing an insulating and waterproof "umbrella" over and about 15-20 ft. beyond a typical earth sheltered home.
With this umbrella keeping the earth dry, thermal energy will travel through the earth, allowing you to store the maximum amount of thermal energy under and around your foundation."
The insulated umbrella also serves as a thermal break between the cold and wet top soil (top 2-3 feet), and the warm and dry soil below, thus increasing the amount of thermal mass available to you to store warmth.
Conventional heating systems are unnecessary!