What is the best wattage for a hair blow dryer?

A 1200 watt blow dryer is the highest legal wattage that you should go. At this wattage you will still be able to plug into a 120 volt 15 amp receptacle without blowing the breaker. Any blow dryers with wattage's below 1200 watts should be purchased depending on what the temperature of the air you need to dry your hair. Keep in mind the lower the wattage the lower the air temperature and the longer it will take for your hair to dry.