One thing that makes some naturals nervous is getting luscious curls from curling that require entirely too much heat.
While it is important to have clean, moisturized hair with any style that gets done to natural hair, obtaining curls without heat is very possible.
Many naturals will feel tempted to blow dry their with a dryer or some other heating device. But, if possible, allowing hair to air dry is the best way to get hair wet-free without excessive heat. It is the best way to avoid accidentally burning natural hair or making breakage.
Now, back to the curls. Even though clean hair is necessary for obtaining pretty curls, it is not necessary for the hair to be bone-dry. In fact, some some of the prettiest curls have been produced off of allowing wet hair to dry. A perfect example of this would be a bantu knot out.
Here is a list of ways to get curls on natural hair without the use of no heat.
Just to give you better direction, check out this video of a natural curling her hair without heat!