I recently got an air purifier for my bedroom because I have allergies and wanted to improve the air quality. I have been using it for a couple of weeks but I started noticing that my throat feels a bit dry in the mornings. I am wondering if using an air purifier can actually dry out the air in the room. I always assumed they just clean the air and remove dust and pollen. I do not run a humidifier normally so this is my first time noticing this effect. The purifier I have has a HEPA filter and some activated carbon layers. I use it mostly on medium settings and it runs for about 8 to 10 hours a day. I have been drinking more water but I still feel some dryness. I am curious if other people have noticed this and if there is a particular type of purifier that does not cause dry air. Should I be worried about this or is it normal? Does anyone have suggestions on how to avoid this problem while still using an air purifier? 
From my experience air purifiers do not actually dry out the air. They filter particles like dust and pollen but they do not remove moisture. What you might be feeling could be related to heating or low humidity in the room rather than the purifier itself. I keep mine on all night and have never noticed dry air.
I felt the same when I first got my purifier. I was worried it was drying out my skin and throat. After checking I realized it was the winter season and the heating in my apartment was causing low humidity. I started using a small humidifier and the dryness went away.
That makes sense, I did not think about the heating effect!
Some air purifiers with ionizers might create a slight sensation of dry air but it is usually very minor. HEPA filters by themselves do not remove water from the air. If you are noticing dryness, try checking your room humidity level. Keeping it around 40 to 50 percent usually feels comfortable.
I use a purifier in combination with a cool mist humidifier. It cleans the air and keeps it from feeling dry. I think it is just about balancing the humidity while using an air purifier.
Make sure the purifier you have is not a device that also has a heating function. Some models claim to purify and warm the air, and that could dry it out. Otherwise normal purifiers should not cause dryness.
I will check if my purifier has any heating functions, thank you!
I noticed dryness when I ran my purifier on high all night, but it turns out the air in my room is naturally dry in the winter. I suggest running it on medium and having a water source or humidifier nearby if needed.
I have a HEPA and carbon filter purifier and it never dries out the air. I think people often confuse the feeling of very clean air with dryness. You might just need to adjust ventilation or use a humidifier at the same time.
If your air is really dry, a small indoor plant can help add some moisture naturally. I have a couple of ferns in the room and they make a noticeable difference.
Some people think that air moving from the purifier causes dryness. It may feel that way, but it is not actually removing humidity from the air. You could try placing the purifier in a different corner and see if it changes the sensation.
I run my purifier in my bedroom and I do not feel any dryness at all. Maybe it is just your body adjusting to cleaner air. Sometimes the first few nights can feel different.
Overall air purifiers are not drying machines. If you are concerned, monitoring humidity and using a small humidifier alongside it is usually enough.
I will try adding a humidifier with my purifier. Thanks for the tips!