About a month ago I bought 2 Holmes air purifiers. I had been sneezing a lot, and the last air purifier I had helped with that. For the bedroom, I bought a Holmes HAP412. It is a small tower unit with 3 speeds and an ionizer. It uses one HEPA filter, and has no filter change indicator. You have to look at the filter to determine if you need to change it. This unit seems to clean the air in the bedroom reasonably well, but I have no method to tell for sure. At night we leave it on high, and use it for white noise. When it was new it was almost inaudible at the low speed, but now it is louder. It's not a big deal for me.

For the living room we got a Holmes Harmony HAP1625. It is a rectangular unit that is designed to be placed against a wall. The air intake is on the front, the exaust is on the top. It's supposed to circulate the air in the room in a circular motion. It has simple digital display that displays speed 1-4. Speed 1 is almost inaudible. 4 is a little loud. It is recommended to leave it on 2 or 3. It can be programmed to turn itself after a preset number of hours.

The HAP1625 uses the same type of filter as the HAP412, but it uses two of them. It also has 2 non-washable carbon prefilters that are treated with baking soda. The HEPA filters are treated with Microban antibacterial coating. They are supposed to last about a year.

Since purchasing these air purifiers I haven't been sneezing very much, and I don't wake up with a stuffy nose. I'm happy with these purifiers, I'd recommened them to anyone to wants to breathe cleaner air.