The most important part of indoor air quality is having a certified competent HVAC contractor service your system at least once a year. Most manufactures recommend twice a year. The indoor coil of an air conditioning system is a breeding ground for mold and mildew. With proper service and cleaning you can drastically improve your indoor air quality. I recommend installing a high quality air filter that does not restrict to much air flow and does not leak air and particles around the filter.
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