I was thinking about how hot it was outside, when a thought came to me. There are propane refrigerators, so why not replace the propane as the heat source with solar heat and then change it from a refrigerator to an AC unit? The only power you might need is for the fan to push the air around.
This seems so obvious, you only need an AC to run when it is hot out and the chemistry is a closed loop reaction of ammonia, hydrogen and water so it never needs refilling. However, if it leaks, it's (mainly) non toxic and green, so why isn't it done?