Does an AC Unit Ventilate Air?
Does an air conditioner ventilate your home? No — most standard air conditioners don’t bring in fresh outdoor air. They recirculate the same indoor air, cooling it and filtering out some dust and allergens, which improves air circulation but not ventilation. True ventilation means exchanging stale indoor air for fresh outdoor air, and for that you need a dedicated solution like an ERV or HRV, a whole-house ventilation system, or (to a limited degree) an AC with a fresh-air add-on. Central, window, ductless mini-split, and portable ACs all recirculate air by default. Many assume that because their
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