No. They just have a sealed heating element just above the edge that scrapes the windshield. At least, that is the way the one I used to have was designed. It didn’t blow hot air.
It worked, but wasn’t very rugged. My unit plugged into the cigarette lighter. The cord wasn’t really very long, so I would have to run the cord out the left window to do that side of the windshield, and then repeat the process on the right side. If I found one for $3.99, I would buy it. I don’t know what happened to the one that I had. It either broke and I threw it away or I misplaced it when I cleaned out my car.