How Long Should You Keep Your Merv Filters?

Changing your air filters is an important part of maintaining a healthy home. For MERV filters 8, 11 and 13, it is recommended that you change the filter at least every 3 months for optimal filtration.

Air filters

rated MERV 11 or higher usually require replacement every three to six months. The Minimum Efficiency Report Value (MERV) indicates the filter's ability to capture particles larger than 0.3 to 10 microns (µm).A general rule for pleated air filters is to change them every 90 days.

As the filter accumulates dirt, dust and allergens, its efficiency decreases. If you notice a thick layer of dirt on the filter, it's time to replace it. A larger home may require HEPA filters to be changed more often due to increased airflow through the system. The higher the MERV rating, the more effective the filter is at preventing air particles from passing through it.

Studies have shown that higher concentrations of particles in outdoor air can lead to poor health outcomes, so filtering these particles out of indoor air can lead to better health outcomes. Simply replacing a dirty filter keeps the system running efficiently, prevents system breakdowns, and can extend the life of your air conditioning system. It also improves the air in your home, keeps the boiler in perfect condition and helps control dust in the air. In general, filters with a MERV 16 rating or lower are suitable for HVAC systems for residential, commercial and general hospital use.

The usual recommendations range from every 30 days for cheaper fiberglass filters (which are often not very useful when filtering), to 6 months for high-end pleated filters. When you change your air filter, you allow more air to flow through the system with lower energy consumption, which translates into better circulation, cleaner air and a lower electricity bill. So make sure you check your home air filter regularly and replace it when necessary.

Cora Koci
Cora Koci

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