How much do whole-house air purifiers cost?

Two kids have allergies, 1 has asthma, and our house is extremely dusty. I want to cut down on the dust, I don’t care so much about killing the bacteria & viruses in the air, so we don’t need the top-of-the-line system(unless it’s under k)
. It needs to cover 1800 square feet.
None of the websites (aprilaire, lennox, etc) post prices, they all refer you to local heating/cooling contractors.


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