Informational Guide

How Often To Change Air Purifier Filter? (All Brands)

by Josh M

An air purifier is essential for people who suffer from allergies and asthma. Air purifiers clean the air you breathe by filtering out the debris and dust particles, reducing the number of allergens in the air.

However, the longer you keep an air filter in the purifier, the more it accumulates debris. Therefore, the capacity lessens. So then the question arises: how often to change an air purifier filter?

You can easily check the filter by opening the air purifier or peek at the original manufacturer manual for any recommendations. How long do air purifier filters last? A general rule is to change your filter every three to six months for optimal performance. If you suffer from a respiratory illness and want cleaner air, then you can change them as often as 30 to 60 days.

Air filters are essential to the function of the purifier. Normally, these devices have one or more filters that act as a purification while the fan passes air through. Filters trap pollutants such as dust, pollen, and bacteria and disperse clean air back into the room, maintaining healthy air circulation.

The only downside is that maintaining your purifier with consistent replacement filters can be expensive. There are air purifiers that run without filters for those looking for a less expensive and lower maintenance alternative. New and innovative products are designed to work without one while giving you the same results. Filters used to be necessary, but now technological advancements prove that purifiers can function without one.

The filter’s lifespan varies depending on what type you have. How long do HEPA filters last? You should replace HEPA filters every six to twelve months, factoring in air quality and the environment. Modern air purifiers are equipped with indicators that illuminate light or beep when needing a replacement. Activated carbon filters should be changed within a year, while mesh pre-filters only last up to four weeks.

Bulex Air Purifier Filter

List Of Filter Brands

We’ll discuss below when to replace HEPA filters on various air purifier brands, such as Dyson, Honeywell, Levoit, and more. The time frame depends on the model and usage. You want to avoid clogging your purifier or risk nasty smells or pollutants escaping into the air.

Some purifiers have filter checks and reset indicators for when the filter reaches the end of its life. You want to replace the filter to get the maximum performance and efficiency out of your purifier.

  • Dyson [every 12 months]
  • Honeywell [pre-filter: every three months; HEPA filter: every 12 months]
  • Levoit [HEPA filter: every 6-8 months]
  • Holmes [carbon filter: every 3-6 months; HEPA filter: every 12-18 months]
  • Coway [carbon filter: once every six months; HEPA filter: once a year]
  • IQAir [once every four years]
  • Blueair [every six months]
  • Sharp [filter life is estimated to last up to 10 years]
  • Areamax [HEPA filter: two years; carbon filter: six months]
  • Hunter [filter: every six months; pre-filter: three months]
  • Aprilaire [filter: every 6-12 months]
  • Molekule [filter: every six months; pre-filter: three months]
  • Winix [carbon filter: three months; HEPA filter: 12 months]
  • Okaysou [pre-filter is washable, wipe the dust off filters with a dry cloth, replace every 6-8 months for better performance]
  • Oreck [recommends cleaning the collector plate after the first month of use; replace the filter every eight weeks after that]
  • Hamilton [filter: every three months,]
  • Alen [HEPA filter: every six months]
  • Austin Air Filters [every five years]
  • Philips [purifier will remind you; 14 days to purchase new filters, needs to be replaced (not monthly)]
  • Carrier [permanent filter: every two months]
  • Pure Enrichment [filter: every six months]
  • Rowenta [HEPA filter: every six months; deodorization filter: every three months; pre-filter: 2-4 weeks]
  • GermGuardian [filter: every 6-8 months]

Related Article – Best Whole House Air Purifiers

Factors That Affect The Frequency Of Changing The Air Purifier Filter

You might notice an increase in your energy bills if you don’t change your filter enough. Additionally, the filter types factor into how often you need to replace them. If you have pets, they contribute dander, pet hair, and fur, which causes your filter to clog quicker. If you have children, you want to make sure they breathe the cleanest air possible.

Your home size also makes a difference; the larger your home, the more sparsely distributed the purifiers need to be. Living in an area with sub-par air quality will influence how often you need to change your air purifier. For example, if you live next to a busy street or factory, something as simple as opening up a window or door means pollutants enter your home.

How Do I Know It’s Time To Change My Air Purifier’s Filter?

If you don’t have a purifier that alerts you with a sound or light, you can easily open up the model and check yourself. Did you know that not changing the filter can affect your health? If you experience headaches, dizziness, fatigue, or other allergy symptoms like a sore throat, that’s an indicator that your filter is kaput.

The filter will often be dirty or gray. Your home could also be dustier than usual, or you might smell something burning. If you can’t remember when you replaced the filter last, or the unit is hotter than normal, it’s time to replace the filter.

air purifier for mold

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

Without regular maintenance, your air purifier can cause issues. The purifier clogs and becomes a breeding ground for germs and mold. The motor has to work harder and could break down. Your allergies might increase due to the reduced filter efficiency. If the filter isn’t disposed of or cleaned, you could render your purifier unusable. In turn, you’ll have to pay more for a replacement down the road.

People Also Ask (FAQ)

Here are a few questions that are frequently asked when it comes to air purifier filters.

Can I reuse my air purifier filter?

You can clean and reuse a permanent or washable HEPA filter multiple times. Be sure to clean it properly without damaging the filter. Gently cleaning it with a vacuum cleaner or washing it with cold water does the trick most of the time.

Remember to let the filter dry for a day before loading it again. Then, check the packaging to confirm you can wash and reuse it; if not labeled, throw it away and replace the filter. If you reuse a filter that’s not meant to be reused, it damages the density, allowing bad particles to escape into your home.

How do you remove and replace the air purifier filter?

Take a look at the owner’s manual. Most of the time, purifiers have a panel you can open or slide out. The filter will be attached inside. You can buy them and replace them, or clean them and reuse them. Remove the filters, clean or replace them, and reset the purifier to remind you of filter maintenance after a few months pass.

Can you run your air purifier all day?

You can use a purifier all day with few drawbacks besides changing your filter more often. If you change the filters, then it can help reduce pollutants easily with little worry. Sometimes ventilation with outdoor air is the easiest and quickest way to reduce indoor pollution. If you live in an area with bad weather or are sensitive to pollen, then an air purifier is a must-have.


Hopefully, after reading this article, you have a better understanding of when you should change your air purifier filter. You also know how often to clean an air purifier filter. Remember to check the owner instructions and keep the filters updated so you don’t run into issues down the road.

Related Article – Are Air Purifiers Worth It?

Last Updated on January 9, 2023

Josh M

My name is Josh and I am obsessed with the HVAC industry. I created this website to help HVAC techs of all levels get the best out of their heating & cooling systems. I have spent thousands of hours studying air conditioners, heaters and home air products so you can learn & buy with confidence. Learn more about the team here.