If the 15% reduction turns out to be accurate, it would seem to be the final nail in the coffin for the idea. It looks like a high SEER mini-split would be the far more economical choice, and a D/C solar one could make it completely off-grid.
I like the fail-safe simplicity of earth tubes, but extracting the cooling while isolating a potentially contaminated air stream in an efficient way might not be doable. It would be interesting to see some real world results from that Blog Ron342!
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