Water to soil is the cheapest system since it doesn't need to be dug very deep as long as you have a big enough surface. I have explored it a bit but for my needs I would need more than 500 square meters of area. I don't know if you can layer it multiple times on top of each other, this would reduce the surface area needed. And I don't recommend using the AC unit year round, no matter how good the inverter is.
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