Passive/active air conditioning

Was reading on how to build a manual water pump but ran across an article on how to build your own air conditioner using a radiator core from a car. Not a bad idea.

It brought back to mind an idea I had for cooling the solarium and possibly the house in the summer. However, taking it a step further.

Original idea involved using solar chimney design for passive ventilation. Then the idea came to mind to add water-soaked filters to cool the air being drawn in. That would result in a large evaporative cooler effect.

Now another aspect comes to mind to make the whole thing more efficient. At least, most likely. Since the water to the well runs quite some distance underground, the water should be rather cold. (May drop a thermometer down the well on a line to see how cold.) By pumping water from the well through small insulated lines to the filters it would make the whole system cooler. Then the water could be used directly or indirectly to irrigate the garden. Similar system could be used for a window unit for the house. Using very small lines would mean needing a smaller pump, possibly run by solar.

An idea to play around with, any way.