Air purifiers are designed to improve indoor air quality, not to reduce humidity. So, the answer to the question of whether air purifiers dry out the air is a clear no. Air purifiers do not have the necessary mechanisms to reduce indoor humidity, and they cannot add or remove moisture from the air. However, air purifiers can indirectly cause problems if they are overused or placed incorrectly. This is because they eliminate things that could dry out the air, such as dust, pollen, and dandruff.
So, while an air purifier cannot directly dry out the sinuses, it can contribute to a dry environment. In conclusion, air purifiers are not designed to reduce humidity or dry out the air. Their purpose is to improve indoor air quality by removing pollutants and allergens from the air. Therefore, if you're looking for a way to reduce humidity in your home, you should consider investing in a dehumidifier.