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...and cutting holes over the soffit toilet air through there!! I had a thermometer up there....
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Phrasing?
The crawlspace air is potentially reeking of Radon gas.
There's nothing magical about 1x2 sleepers.
https://en.wikipedia.org/wiki/Double_envelope_house
See also
Buckminster Fuller's Chilling Domes
acparker's solution is genius.
May I suggest a water-to-water-to air heat exchanger? If I was building that's what I would do:
Drill a ~8-10" hole 20ft deep.
Sink a ~8-10" capped PVC pipe maybe 18ft long with a box on top for maintenance
Insert a copper pipe double helix secondary water pipe into the PVC
Put the water-to-air equipment wherever convenient.
Drilling a hole is easier than cut and fill trenching. The PVC is a passive tank. The copper pipe contains the working fluid. I saw this proposed in Pop Mechanix, minus the obvious improvment of the double helix.