Geothermal tunnel

Bury the pipe and you'll see. It is possible to use the energy, which is located just a few meters below the surface of the heating, cooling? Of course, heat pumps ground water used this possibility. But it is possible

Solar chimney

Why would the Sun not cool? Use a chimney to ventilate is certainly not a novelty. Use the chimney to the cooling is quite an interesting feat. Solar chimney increases the energy of the Sun to move the chimney.