The cold setting on a blow dryer is designed to blow unheated or cool air, as opposed to the warm or hot air produced by the dryer's regular settings. The cold setting is typically activated by pressing a separate button or switch on the blow dryer.
When you switch to the cold setting, the blow dryer's heating element is deactivated, and the motor continues to blow air without the added heat. Instead of warm air, the dryer blows ambient temperature or slightly cooled air onto your hair.
The cold setting serves several purposes:
Cooling down: After using the hot or warm setting, switching to the cold setting helps cool down your hair and scalp. It can provide relief, particularly if your hair is sensitive to heat or if you've been using high heat for an extended period.
Setting hairstyles: The cold air can help set and lock in your hairstyle. When you style your hair using hot air, it can make your hair more pliable, but once it cools down, it retains the shape better. By using the cold setting, you can help maintain the style you've created.
Reducing frizz: Cold air can help reduce frizz by sealing the hair cuticles. When you blow dry with hot air, the hair cuticles open up, making them more susceptible to frizz. By finishing with cold air, the cuticles close, providing a smoother and shinier appearance.
Scalp stimulation: The cool air can provide a refreshing sensation and stimulate the scalp, promoting blood circulation and potentially helping with hair health.
It's worth noting that some blow dryers offer different levels of cold air, ranging from mildly cool to more intense cooling, allowing you to choose the intensity that suits your preferences or specific styling needs.