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How often should I change my HVAC filter?

Short answer

Often every 1 to 3 months, more with pets or allergies. Check it monthly.

Rules differ by state. This is general information, not legal or professional advice.

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Official sources

Energy Saver (U.S. Dept. of Energy)energy.gov
CDC: carbon monoxide safetycdc.gov
Ready.gov: extreme heat and winter weatherready.gov