It is important that hair dryers contain a filter. Hair dryers use the same working principle as vacuum cleaner: sucking air inside. With air it can suck inside hair, dust, and little micro pieces of dirt. If a hairdryer does not have a filter, all this can cause overheating and device can burn out quickly. This is why try to choose a model with cleanable filter. Also, there are models that switch off automatically if overheated.
First of all, let’s decide what you need a hairdryer for. If you need it just to dry your hair, then you need a powerful hairdryer with one attachment: a concentrator. If have thin hair low-power model will suit your needs. If you want dry your hair and, at the same time, style it, then choose model with several blow speeds and temperature modes (most powerful for preliminary drying, middle for hairdos, and cold air mode for fixing a hairdo).
Hairdryer—the brush was invented for short hair. This model will dry and style your hair at the same time, give your hairdo volume. There is air electric brush for making curls, it produces hot air stream powered not more than 200 watts. Such models usually have two or three types of attachment.
Average hair dryer capacity is 1000–2000 watts. More powerful models will style you hair better but short hair styling does not require very powerful hair dryer. The advantage of powerful best hair dryers is that the more powerful air stream the less hot temperature you need. Permanent waved hair, weak or thick hair should not be styled in a hot mode, if you have such hair, choose model with several temperature modes.
If you need a best hair dryer to do your permanent waved hair then you need a model with diffuser attachment. Diffuser attachment is a 10–15 cm diameter disk with surface that contains rounded ‘fingers’. It is meant for doing hair with perm and for wavy hair. ‘Fingers’ can have different length, according to head relief. Usually, they have rounded shape, hollow and have holes. Such design helps to disperse hot air stream, directing it to curls, not to scalp.
When buying a hairdryer draw your attention to comfort—it should be comfortable to hold a hair dryer while rotation the wire should not twist. Control buttons should be easy to access, hair dryer should not be too loud and too heavy. It is also comfortable if the hair dryer has a loop to hanging up. More explained here: https://www.allure.com/gallery/best-products-for-your-hair-type
There are plenty of best hair dryer units found at the market today. Many women prefer buying “professional models” in the sense that if there are pros of using them then it means that they are much better. This is not true. Of course, good professional model will be better that bad mass market model. Professional models are being constructed taking into consideration the fact that it has to work 8–10 hours per day every day. Also, clients’ hairstyles very different and the professional model must have 2–3 temperature modes and 2–3 blow speed motions. Additional features include cold blow motion and different attachments. If you do not plan to use all the advantages of professional model, it’s better that you do not waste money on it because on mass market you can find best hair dryer models that have the advantages of professional models.