Introducing the Solar Sucker (Earth Tubes 2.0)

The Solar Sucker
Heats up the earth by creating a passive airflow through it. Taller side painted dark matte and exposed to sun thus creating an up-draft. This pulls air into the short side. The air, even on the short side, is warmer than the earth so the earth is heated up. Note the tube is completely outside of and under the building, i.e no contact with inside air. This means possibly moldy tubes is not a big deal.
Option to tall side could be a common solar heat collector type thing.
Care should be taken to not let anything into the tube. Water could probably be pumped up easily. If building in steep slope, there could be T-section with pipe to drain easily.
Works best exactly when it should, i.e when sun shines the most. I would guess the reverse effect will take place if air is cooler than ground, i.e the taller side will pull down. Doubt it'd be as effective as heating tho. Regardless, you can add a very simple check valve. Ask me if unclear how.

Variant to "vacuum" cold or humid air from basement or crawl area. New (warmer) air comes in naturally or open door. Nothing to dig down, simply "bring out the vacuum cleaner" and stick it through a window or vent and other end high up.

The Wind Sucker a.k.a the Hot Blow Sucker
Instead of having the sun passively drive the air, the tubes end with special mouth pieces to let the wind drive. Picture shows outlet side. Fin steers so mouth points away from wind, creating a vacuum effect pulling out the contents of the tube. Inlet side is similar but so mouth meets the wind thus pushing the hot air into the tube and ground.
Can be used both for warming up and cooling down.

Note that care should be taken with the Solar Sucker to not expose its ends to wind... or you get:

The Super Sucker
Combine the two concepts.


Mat, the Swede