They're expensive, but I don't have to change them often. Since I haven't done any dust research and don't live in a controlled environment, is it really better than other filters I've used in the past? I believe this is actually a MERV 11 filter, so it should remove a lot of nasty things from the air that I would otherwise breathe. My heat pump has not shut down or is overloaded so the filter is still letting air through. So he gets 5 stars for his work and only needs to be changed annually, although with 4 dogs he should probably be changed more often.
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