The above illustrations mean Essence (1) is cheapest and most effective. If you practice (1) and (2) then you have best cost performance
Actually (1) and (2) are so effective, building can keep night time temparture even during day time. (3) and (4) uses temperature difference day and night so become not so effective. Our temperature difference day and night are 5 to 6 degrees, need more difference for (3) and (4). There is merit to have (3) and (4), I'm happy with I could make it, But cost performance are not good.
My recommendation is just practice (1) and (2). Those are amazingly effective.
Anybody can come up with those ideas but nobody actually tries yet. So I think I should do that. Because any idea not tried actually are not practical. I volunteer to become a scapegoat for this project.