Actually, I find blowdryers to be a bit unhealthy for the hair. Whenever I wash mine, I always sit out in the sun to naturally dry it (for about 15-30 minutes) and then come back inside to put on a shirt.
Not only will this not dry hair completely (thus missing the point), hairdriers on lower settings are perfectly healthy for the hair. Higher settings are best left to short hair, though, since short hair dries more quickly under the heat without any damage.
If you dye your hair twice it will make it look brighter red, yeah. It will also badly damage your hair and cause very bad split ends. I would suggest getting your hair cut, instead, so you can fit into society.