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While you can run your HVAC system without an air filter, it isn’t something professionals recommend—especially not for an extended period. It can reduce indoor air quality, clog air ducts, and strain your system. This can lead to performance issues, higher energy bills, costly repairs, and a reduction in the system's lifespan.

Clogged filters, malfunctioning sensors, wiring issues, and reduced airflow are common problems.

Air filters with a high MERV rating, 11 or above, shouldn't cause airflow problems in most residential systems. However, the airflow can be restricted in some HVAC systems if they aren't designed for high MERV ratings. If in doubt, a local duct installer should inspect your ductwork so that you know what your system can handle.

You should plan to change your AC unit's filter every one to three months, depending on the manufacturer's recommendations. You should also clean the coils at least once per year, but if you have pets or someone in your household has allergies, you might need to clean them more often. Fortunately, many pros will clean the coils and change the filter for you during an inspection, which you should schedule once or twice per year.