That's it.
Experimentation will tell the true story. The loop is comprised of ten, 4 inches across, fifty foot long corrugated tubes buried 6 feet underground.
I'll log the inlet and outlet temps along with the mass air flow to see what I can get out of it next winter. I spent only $300 on the loop. From the calculations I did before proceeding I'm very confident I'm going to be able to make up for it in a few years.
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