I was unsure about size but then I used the CADR rating to figure out what would work for my space. That helped me decide on a purifier that can cover my entire apartment. Make sure to check this rating before buying.
That is a great point, I did not think of CADR ratings before.
Noise was my biggest concern so I went for one with multiple speed settings. I keep it on low at night and high during the day. It works well and I can sleep without distraction. The difference in air quality is very noticeable.
I tried a cheap generic brand first and it did not make any difference. I learned that investing in a known brand with good filters really matters. Do not go for the cheapest option if you want real results.
Some people might not need all the smart features. If you just want clean air and low maintenance, a simple HEPA filter purifier works well. I recommend reading reviews for the room size you have and making sure the filters are easy to replace.
Energy efficiency is something I considered too. Some purifiers use very little power even when running constantly. I like that I can leave mine on all day without a spike in electricity bills.
I use a combination of HEPA and activated carbon filters. Dust, pollen, and odors are all reduced significantly. I noticed that after a week my apartment smells fresher and the air feels lighter.
I would suggest picking a brand that has good reviews, fits your space, and is not too loud. Personal experience matters a lot so do not rely solely on online descriptions.
I will try the HEPA and activated carbon combination, sounds very effective!