Most air purifiers today do not dry out the air as they’re not removing any moisture during the air filtering process. You can think of air purifiers as more advanced fan devices or ionizers – they filter the pollutant particles but cannot trap moisture in the air. In other words, they’re air purifiers not dehumidifiers. That being said, there are some purifiers that remove moisture from the air, however, they have specific instructions regarding water-buildup (for example, how often you need to empty the catch basin). None of the devices on our Top List dry out air.
If you find that the air in the room where you keep the purifier feels drier than usual, it could be due to the air conditioner. Cold air cannot hold water vapor as well as warmer air can, plus ACs reduce the humidity significantly, making the air in your room quite literally drier.