My damn AC broke

[Astrosfan]

so, coming back from Austin the other day, my Air conditioner stopped working. Its still blowing, just, hot humid air. There has been no signs up to that point of AC getting weaker, which leads me to believe that its not low on freon.... It just all of a sudden stopped blowing cold.

Any ideas on what this could be? I was hoping to get some insight before taking it either down the street to a shop or to my dealership....