Had a Lenox PureAir sytstem installed a few years back. While I have no quantifiable data to prove it, the air does seem cleaner, there is less dust and odors go away very quickly. For me, an important feature is the UV bulb part to purify air. The two filters are easily changed (only need to do it once a year) and the bulbs last very long -- maybe two years or more. Filters & bulbs available from Amazon. Don't recall price but it was in the $1,000 range back then. It's not easily installed by owner.
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