When to Replace Air Purifier Filter and the Benefits You Get

Josh Mitchell

Written By

Josh Mitchell

Expert Reviewed By

Holly Curell

Last Updated On

“If you make a purchase using our provided links, we may receive a commission. Learn more here.

Key Takeaways

  • Frequency of changing air filter depends upon the overall air quality and the environment and your health conditions. 
  • Changing your air filter every 3 to 6 months is recommended. However, you may have to change it more often if you suffer from illness.
  • Replacing the air filter helps promotes pristine air quality and keeps the device in optimal working condition.

As air purifier filters cycle the air and collect debris, their ability to trap allergens slowly decreases, therefore reducing the air quality in the home.

That means you’ll eventually need to change your air filter, but how do you know when? The general rule is to change it every three to six months.

Let’s take a closer look at when to change your air filter to ensure your indoor air remains clean and free of allergens.

How Often Does The Air Purifier Filter Need Changing? (For Different Brands)

Depending on air quality and the environment, a HEPA filter may last six to twelve months. Activated carbon filters should be changed annually, while a mesh pre-filter should last up to four weeks.

Generally, changing your filter every three to six months is recommended for optimal performance. However, changing it every 30 to 60 days may be necessary if you suffer from respiratory illness or want cleaner air like me.

Why So?

Air purifier filters are essential for purifiers to function properly. As air passes through the filtration system, air filters trap allergens, dust, pollen, pet dander bacteria, and other pollutants. Then clean air is released back into the room, improving air quality.

I learned quickly that the cost of these filters adds up quickly. So you’re not buying filters before it’s necessary, check the device’s manual for instructions or simply open it up and take a look.

Some air purifiers have indicators that let you know when it’s time for a filter replacement so there’s no guesswork.

While permanent filters don’t require replacement, you’ll need to clean permanent filters to eliminate accumulated particles.

Many air purifiers now exist that don’t require air filters, but they may not be as effective at stopping the tiniest particles as traditional filter-based models.

Related Article – Best Whole House Air Purifiers

Benefits Of Routinely Changing Your Air Purifier Filter

Replacing my air filter on a regular basis has been crucial for maintaining optimal air quality and the longevity of my air purifier. Here are the top three benefits of replacing your filter:

  1. 1
    Better indoor air quality:
    An air filter replacement ensures that particles like dust, allergens, and even the tiniest particles are trapped, improving indoor air quality. Breathing becomes easier, and you’re less likely to experience immune system, allergy, or asthma symptoms.
  2. 2
    Less cleaning required:
    Changing your air purifier filters regularly helps trap more dust and reduces the dust that settles on surfaces such as tables, countertops, upholstery, and blinds, saving you time on cleaning.
  3. 3
    Proper air purifier functioning:
    Regular air filter replacements ensure your air purifier works correctly without straining its components. This helps to avoid potential damage and saves you money on possible repairs.

Factors That Affect The Frequency Of Changing The Air Purifier Filter

There are several factors you should consider when deciding when to replace the filter in your air purifier: 

  • Energy bills may increase if you don’t change the filter often enough.
  • Filter type affects how frequently replacements are needed.
  • Pet owners may need to replace air purifier filters more often due to dander, hair, and fur.
  • Parents should prioritize clean air for their children.
  • Home size affects the number of purifiers needed.
  • Living in an area with poor air quality may require more frequent filter changes.
  • Opening doors or windows in polluted areas can bring pollutants into the home.

How Do I Change My Air Purifier’s Filter?

Changing my air purifier’s filter is actually pretty simple. To change the filter on your air purifier, just do the following:

  1. Turn off your air purifier and unplug it from the power source.
  2. Locate the filter cover on the back of the air purifier. Note that the location and type of cover may vary depending on the model of your air purifier.
  3. Remove the filter cover by gently pulling the top of the cover towards you. Be careful not to break any clips or hinges.
  4. Using one hand on each side, carefully remove the used filter from the filter slot. Take note of the direction of the arrows or markings on the filter that indicate airflow direction.
  5. Discard the used filter and replace it with a new air filter. Make sure to choose the correct type of filter that is compatible with your air purifier model.
  6. Install the replacement filters the same manner as the previous filter, making sure to align it properly with the arrows or markings on the filter slot. Gently press down on the filter to ensure a snug fit.
  7. Replace the filter cover by aligning it with the slots or hinges and pushing it back into place. Make sure it clicks or locks into position.
  8. Plug in your air purifier and turn it back on. Check that the filter replacement indicator is reset or adjust it according to the manufacturer’s instructions.

Remember that not all air purifiers are the same, so be sure to consult your user manual or manufacturer’s website for specific instructions on how to change the filter on your particular model.

What If I Don’t Change The Air Purifier Filter?

Neglecting to change your air filter can lead to various issues. Regular maintenance is crucial for your air purifier to function properly and last for a long time.

For example, a dirty or unchanged filter can become clogged, allowing more pet dander and other allergens into your air. A clogged filter is less effective at trapping particles. This can worsen your allergies and reduce the air quality in your home or office.

A dirty filter can also become a breeding ground for germs and mold, which can spread throughout your indoor space. And when the filter is clogged, the motor has to work harder to push air through, which can cause it to break down prematurely.

Don’t let filter neglect turn into a costly air purifier replacement. Following the manufacturer’s recommended maintenance schedule will help you avoid damaging your air purifier beyond repair. Taking care of your air purifier keeps your indoor air clean and saves you money in the long run by avoiding expensive repairs or replacements.

People Also Ask (FAQs)

Can I reuse my air purifier filter?

You can reuse air purifier filters. First, check the packaging to confirm it’s washable and reusable; otherwise, you’ll need replacement filters. Reusing a non-reusable air purifier filter damages its density and allows harmful particles to escape into your home.

Can you run your air purifier all day?

You can run your air purifier all day. Just be sure to change your air purifier filters more often. Proper ventilation will help your purifier reduce indoor pollution.


Investing in an air purifier was an excellent decision for my family and me. My air purifier has worked wonders, but since the filters collect debris, their ability to trap allergens will decrease over time.

To keep your indoor air clean and free of allergens, you must change your air filter every three to six months or more frequently if you have pets or live in an area with a lot of airborne pollutants.

Following this simple rule will ensure your air purifier continues to work effectively, and you can enjoy clean, fresh air in your home all year.

Related Article – Are Air Purifiers Worth It?

Was This Article Helpful?

Josh Mitchell


Josh Mitchell
My name is Josh and I am obsessed with home appliances. From portable AC units to heaters and air purifiers, I enjoy testing, learning and using these devices to improve the air quality inside my family home.

My Favorite Home Appliance?

Midea U Shaped Window Air Conditioner

See Our Editorial Processes

Meet Our Team

Share Feedback