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.
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overstockcustomercare1 on May 9, 2013
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