How to build a $30 air conditioner
An enterprising college student built an air conditioner for under $30 with a fan, a garbage can of ice water and some tubing.
How the contraption works: cold ice water flows through coiled tubing attached to the back of a fan which cools the blowing air. The condensation could get messy and you won’t get the same results as a store-bought A/C, but this is a cool (har) DIY project for the broke and sweaty.