This is the difficulty with all cooling solutions that isn't an AC. The efficacy of each method depends heavily on the climate for which it was developed. What

This is the difficulty with all cooling solutions that isn't an AC. The efficacy of each method depends heavily on the climate for which it was developed. What works in dry SoCal doesn't work in humid Japan, and what works in Japan might not work in Dubai. The future of energy-efficient cooling is not going to be one solution that fits all. There are going to be different solutions for each region. Summer weather can vary wildly even in the same place, so many solutions will end up using software to actively adjust its own mode of operation based on sensor readings, just like a modern HVAC system. You don't want your cooling apparatus getting all moldy when it rains unexpectedly.