Not trying to resurrect a zombie thread here, but I happened upon a YouTuber who has built his own desiccant air conditioner. If this link dies, search for Tech ingredients solar air conditioner.
Initial proof of concept design:
https://youtu.be/R_g4nT4a28U
Improved and simplified design:
https://youtu.be/7w4rg3UcsgI
The author states that the cop of his system is roughly double that of a standard window air conditioner.