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I wonder if there's an efficient way of converting the latent heat in the air, even in places with high humidity into energy.

Nope. Heat is disorganized high entropy energy. We can't convert it into lower entropy energy like electricity or motion.

Now, a heat difference (resulting in heat movement) can be made to do useful work.

My understanding is that underground is a constant 50-60°F — wouldn’t that provide a heat difference?