Radiative cooling

One of my goals out west is to be able to trim my energy usage down to a bare minimum.  Also, to recycle as much water as I can.

This post describes the use of the principle of radiative cooling in order to climate control a building and thus use the least amount of energy.

I have a hunch that this principle could work in a concept known as an air well.  It condense water passively.  Out there, especially during the summer months, it can get fairly humid.  I figured that dehumidifiers can collect water, but what if you could do it without electricity?  That would be, pardon the pun, "cool".

Update:

Did a little more googling, and found this post on photonic crystals.  The post says that the surface temperature can be reduced by 30 degrees.  Very interesting.  That means on a 100 degree day, this thing can bring the surface temp down to a comfortable 70 degrees.

Bring it on.

Update:

Nature paper here.  Not as dramatic as above, but useful nonetheless if it were to be available for purchase.  No word on that.

Update:

More info here.