Hail dings in metal siding

A friend's siding was dented in a hail storm in Kansas. He spent nearly a year in the desert near Palm Springs and most of the dents had disappeared. The combination of heat and cold must have helped the metal back into orginal shape.

On YouTube there are videos where dents in cars are removed using the heat from a heat gun and then cold air from a spray can of air used to blow dust out of electronics. The dents pop back out. Maybe it would work on siding for some of the more pronouced dents.