I've only had this product for a month, but I noticed an improvement in the air in the first 48 hours. I have it on 24 hours a day, medium speed during the day and quiet/low at night. It is quieter than my central A/C, but I think it might be getting louder as time goes on, but still not unbearable.
Hi vaga2bondia, replacement parts can be ordered through the manufacturer website. The filters for this product are permanent and we do not offer replacements. We apologize for the inconvenience. overstockcustomercare1 on Sep 6, 2013
Its HEPA filter is permanent and never needs replacement.
Thank you for shopping Overstock.com, let us know if you have any additional questions.
overstockcustomercare1 on May 9, 2013
Shop Overstock.com and find the best online deals on everything for your home and your family. We work every day to bring you discounts on new products across our entire store. Whether you're looking for memorable gifts or everyday essentials, you can buy them here for less.Shop O.com®IT'S ALL ABOUT THE O - OVERSTOCK.COM