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A person replacing coway airmega filter learning the importance of changing a HEPA filter on time.

The Importance of Changing Your HEPA Air Filters on Time

Maintaining a clean and efficient air purifier is crucial for ensuring the purifier's longevity. To do so, it's essential to change your HEPA filters on time. So let's take a deep breath and embark on a journey toward cleaner air and a greener lifestyle.

A room with a person who has changed HEPA filters on time.

Preserve your purifier’s longevity

Regular cleaning of the prefilter, and on-time replacement of HEPA filters can further the longevity of your purifier. Using third-party filters can also lower the efficiency or damage your purifier, so be sure to order proper replacements that were designed for your machine.

Maintain cleaner air

Changing your purifier’s air filter ensures cleaner, fresher and healthier air. This is better for everyone in your home, but it’s especially important for children, elderly and those who may suffer from allergies or asthma. Clogged filters can recirculate pollen, dust, and harmful particles instead of purifying the air. 

Information about how HEPA filters work.

Save money

Aside from protecting your purifier from unnecessary damage, replacing a clogged filter can also save you on operating cost. A dirty air filter is forced to use more energy than a new, clean air filter, which means a much higher electricity bill for you. Keep your air filters clean and in good condition, and you could save up to 15% on utility costs.

Protect the environment

Failing to clean and replace your air filter on a regular basis is essentially failing the environment. Running your home in an eco-friendly manner doesn’t necessarily mean giving up all forms of comfort and ease in your life. Something as simple as changing an air filter regularly can go a long way in saving energy, and making a difference. 

A classroom with air purifiers and HEPA filters.

How do I know when to change my air filter?

Advanced air purifiers like the Coway Airmega will notify you when to clean or change any of your air filters. Indicators will light up, depending on the action needed. Carbon filters need to be replaced about once every six months, and True HEPA filters about once a year, depending on how much air they have processed. When the pre-filter indicator light is on, clean the unit’s pre-filter to ensure Airmega can run at maximum efficiency.

Alexa integration

If you want to be sure to replace your Airmega filters on time, Alexa can help. Once paired, Alexa will remind you when filters need to be cleaned or replaced. You can even set up a smart reorder with you through Amazon to keep your purifier running at its best. 

Learn more about the Airmega here.


1Coway air purifiers have been proven to trap dust, pollen, dander, viruses and bacteria in the air based on KCL (Korea Conformity Laboratories) testing.They have been tested in a 30㎥ size chamber according to the Korea Air Cleaning Association standard (SPS-KACA 002-132:2022 Modified) to measure the 0.01㎛ size of particle removal rate. It was tested on maximum airflow speed in normal room temperature and humidity conditions. The performance may vary in the actual living environment of customers.
→ Tested with Airmega Aim, 100, 150, 160, AP-1216L, AP-1512HH, AP-1512HHS, 200M, Icon, IconS, 230, 240, 250, 250 Art, 250S, 300, 300S, 400, 400S, ProX

299.97% of viruses, bacteria, fungi and pollen were verified to be removed from the air for Coway air purifiers which have Green True HEPA™ filter applied based on the Japan Food Research Laboratories(JFRL) testing according to JEM 1467 standard.
→ Tested with Coway Airmega AP-1512HH, AP-1512HHS, 250, 250 Art, 250S, 300, 300S, 400, 400S
→ All tested by JFRL and received above result within below time.

All tested by JFRL and received above result within below time.

- Virus: Tested with Escherichia coli phage ΦX174 NBRC 103405, 60 minutes
- Bacteria: Tested with Staphylococcus epidermidis NBRC 12993, 60 minutes
- Fungi/Mold: Tested with Penicillium citrinum NBRC 6352, 60 minutes
- Pollen: Tested with Cedar Pollen extract, 60 minutes

3Aerosol test conducted in a Biosafety level 3 laboratory with two Coway air purifier models, Coway Airmega 250 and 400 for removal of SARS-CoV-2 Aerosol by US based MRI Global, a not-for-profit laboratory and partner of US Department of Defense. The test was conducted in a 13.1ft3 chamber. Virus was aerosolized for 15 minutes and the product was turned on high for 2 minutes. Result showed each product effectively removed over 99.98% of the SARS-CoV-2 in 2 minutes. This is a result from a laboratory experiment condition and result may vary in different conditions. This result does not imply it kills SARS-CoV-2 or prevents the transmission of Covid-19. Coway Airmega 250S and 400S are identical to the tested models and has equal performance with an additional mobile connectivity function.

4The concentration of ammonia, acetaldehyde and acetic acid were proven to be removed within 30 minutes by FCG Research Institute, Inc. Human Life Science Lab. It is not a demonstration result in the actual use space. Not all odors and gases may be supported. → Tested with Coway Airmega 150, 160, AP-1512HH, AP-1512HHS, 400, 400S

5The coverage area of the air purifier is based on an area where the air cleaner can make two air changes per hour (ACPH). An air change per hour translates to how many times an air purifier can clean an area, assuming the height of a ceiling to be 8 ft, in one hour. Therefore ** means two air changes per hour means that the cleaner can clean the area once every 30 minutes and * means air changes per hour means that the air purifier can clean the area once every 60 minutes.

10Terms and conditions apply. Discounts, including promotions, coupons, bundle discount and subscription discount, cannot be stacked on top of other coupons. During promotional periods, discount codes will not be able to be applied to orders. Promo codes may apply to products only—filters, accessories, and new products within 3 months of the release date are not included.