Here's a picture of a woman having her hair dried in the 1920's.
Since she's so dressed up and posed on the table this must have been an ad shot for something, but it still makes me laugh.
The first hand held hair dryer was invented in the 1890's but wasn't used too much til later on.
This from a 1924 issue of Popular Mechanics for Women explains how to make a hairdryer out of parts from a vacuum cleaner and toaster.
And my mother had one of these for years, she never seemed to want to give it up.