It would be too hot. The cooler of temp you can dry hops with, the better. Now, if you did just tumble dry where the heater core didn't engage, I could see that working if there's a middle rack to keep the hops from being mashed up.
Now I don't have any hops to dry but my drier has an ultra low heat or an air dry feature. Maybe someday I will give it a try. I hope to plant some next year.