They dug last week, and the footing and foundation was poured. I plan to get a mini-split ductless heat pump installed, so yesterday was earth tube evening! I burried ten, fifty foot long, 4 inches non perforated corrugated poly tubes. These will hopefuly preheat the air in the winter and precool it in the summer.
I had a bit of space behind my attached garage as the house extends 18 feet farther, so I had them dig a bit wider at that point in order to place a fifty foot loop there. Total cost of the project so far was 300 bucks. I'll then have to build manifolds to duct those tubes properly between the heatpump intake and the blower I'll probably have to use.
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