A/C without electricity
Following on from the “it would be nice to run the aircon” theme, why not use a solar powered system to run a cooling system directly, in the same way that a gas-powered fridge works. No heat to electricity to chemical to electricity to motion transducers required, just heat to motion (of the refrigerant).
http://home.howstuffworks.com/refrigerator5.htm
It would only be good as a backup system; no good for de-misting on a rainy day etc.
Just an idea, feel free to build on it or shoot it down.