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Using wood as a solar battery?

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Location: Bellevue, WA
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Thought this was a pretty interesting idea for home building...

Basically, what this guy is doing is using wood as his master insulator to store heat. Apparently solid wood is masterful at capturing heat during the day and releasing it at night. But the construction must be just so. The houses this guy builds have no additional insulation in the walls, and apparently are much more efficient at retaining and venting heat than the average home.

So instead of needing to install a heat pump or heat exchanger, the house itself *is* a heat pump. Could this really work?

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This style is usually referred to as an "envelope house".

I researched it quite a bit a few years ago.  Although it has been around a long time, and apparently works pretty well, it doesn't have much of a following.  I think because of the expense.
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