I'm looking at the possibility of a high tunnel. I've seen several youTube videos where people used buried irrigation pipe to bring up warmer air for the winter. However, most seem to be 4+ feet deep. If I went that route it would be about 2-2.5 feet until I hit clay (my stopping point). Does anyone see any benefit from shallow pipe? I don't see it but figured maybe someone else is in the same predicament.
Louisville, KY - Zone 6b (near border of 6a), Heat Zone 7, Urban habitat
"Si hortum in bibliotheca habes, nihil deerit." [If you have a garden and a library, you have everything you need] Marcus Tullius Cicero in Ad Familiares IX, 4, to Varro.