When To Change Hepa Filter Air Purifier – [Truth Is Here]

It is no denial that an air purifier is one of the most vital pieces of equipment that you need to purify the air quality in your room – both for your office and home. And, a good-quality air purifier can purify the air of your room when it has a HEPA air filtration system.

when to change hepa filter air purifier

So, you might be thinking what exactly is a HEPA filter? When to change HEPA filter air purifier? How often should you change HEPA filter in air purifier? How long does a HEPA air filter last? Is a HEPA air filter worth the money?

These are basically the most common questions every homeowner does have in their mind before they can make the final decision regarding whether to purchase an air-purifying machine that has a HEPA filtration system.

In this article, I am going to answer all of the above questions so that you can get a clear idea on when to change HEPA filter air purifier or the signs that indicate you need to replace your HEPA air filter.

At the same time, I will also try to describe some other important factors regarding the HEPA filter air purifier.

So, without making any further due, let’s jump into this discussion on how often should you change hepa filter in air purifier….

Basics of HEPA Air Filter

Before I begin the discussion regarding the frequency of changing the HEPA air purifier filter, I think it is very much important to share a short description of the basics of HEPA air purifier filter.

The term ‘HEPA’ is basically an acronym of which the elaborative form is High-Efficiency Particulate Air.

You should also note down the fact that any ordinary air purifier filter cannot achieve the level of HEPA filtration system. In order to be an authentic HEPA filter for an air purifier, a filter has to meet several critical conditions set by the United States Department of Energy.

According to US Government Standards, The HEPA air filters should be able to eliminate approximately 99.97% of air particles which can be as little as 0.3-microns.

Since these types of filters maintain some kind of high standards, so they are implemented in highly efficient air purifying machines. And, this type of air purifier is used in special facilities where the air quality must be purified, such as hospitals and nursing homes.

However, these kinds of air purifying machines are now used in homes and offices as well.

The Best Rated HEPA Air Purifying Machines

If you are looking for the best performing HEPA air purifying machines for your homes and offices, you can choose from any of the following options –

  1. Germ Guardian True HEPA Filter Air Purifier.
  1. LEVOIT True HEPA Filter Air Purifier.
  1. PARTU HEPA Air Purifier.
  1. Winix 5500-2 HEPA Air Purifier.
  1. Honeywell HPA300 HEPA Air Purifier.

In order to have a detailed idea about these highly efficient HEPA air purifiers, you can check out my hands-on reviews on the best-rated HEPA air filter purifiers.

What Is HEPA Filter Made of?

According to the US Environmental Protection Agency, an efficient or highly efficient air purifying filter may consist of the following elements –

  • Metallic wools.
  • Synthetic foams.
  • Expanded foils & metals.
  • Coated animal hair.
  • Synthetic fibers.
  • Coarse glass fibers.

For a HEPA air filter which is usually used in an air purifier, a minimum of 16 MERV score must be achieved in order to rank it as high quality and highly efficient.

When To Change Hepa Filter Air Purifier?

The moment you buy a HEPA air purifier filter, the next thing that will arise in your mind is when to change HEPA filter air purifier, or how often should you change hepa filter in air purifier.

In this case, the first thing you have to keep in mind is that the answer to the question – how often to replace hepa filter in air purifier or how long does a hepa air filter last – depends on the HEPA system compatibility and HEPA Technology used inn your HEPA filter air purifier.

So, you must follow all the instructions compatible with the HEPA filtration system of your HEPA technology air purifying machine.

With that being said, for most of the HEPA air purifying filters, it is essential to change them once within 6 months, especially when the filter has elements like carbon.

However, you should also keep in mind that some HEPA air filters may serve you efficiently for two years without showing any major issue.

So, if you are not sure about how often you should replace HEPA filter in air purifier, I would recommend you to change it after a period of 6 months because it will keep you on the safest side.

In addition, it is also mandatory to replace or change the HEPA filter in your air purifier the moment you experience any kind of warning signs.

Major Signs That You Need To Replace Your HEPA Air Filter

As I have stated above, it is your duty to change the HEPA air filter following the instructions mentioned in the instructional manual provided by the manufacturers.


If you are completely unsure about how often HEPA filter should be changed or replaced, you can change or replace it once every 6 months.

In order to help you in this case, here, I will mention some of the major signs that will tell you to change your HEPA air filter –

  • If your HEPA air filter seems to be dirty or gets a greyish look, for instance, having a huge quantity of visible debris and dust, you must take the necessary steps to change your air purifier’s filter.
  • Keep in mind that any kind of dust or debris stuck to your air purifier’s filter will get mixed into the air of your room which will circulate and enter into your lungs as well as the lungs of your family members and loved ones.
  • If you feel something wrong with the airflow released by your HEPA air filter purifier, you should take immediate action for changing the filter of your air purifying machine.

Other Signs That Tell You Need To Change Your HEPA Filter

In addition to the major signs that I have already mentioned in the above section, there are some other signs that will tell you to replace your HEPA air filter.

In this case, the sign that you should be very much concerned of is the air conditioning or heating functions of your HEPA air purifying machine. keep in mind that if any of your air purifier’s functions take somewhat longer time than the usual, you should check your HEPA air purifier.

In most cases like these, the best solution is to change the HEPA air filter of the air purifying machine.

At the same time, if you hear any weird sound like ‘whirring’ at the time of turning on the device, it may also be considered as a sign to replace or change the HEPA filter of your air purifier.

However, before you change the HEPA filter, you can also try cleaning the HEAP air filter first so you don’t need to waste your hard-earned money.

The Importance of Replacing Your HEPA Filter

Actually, there are a number of reasons why you should replace or change the HEPA filter of your air purifying machine.

Here, in the following, I will mention only the major reasons –

  • It will help increase the air-purifying capability or longevity of your air purifying machine.
  • Replacing an air filter can play a significant role in maintaining cleaner air.
  • It will definitely save your money by keeping the condition of your air purifier efficient enough for a longer period.
  • It will also help protect your surrounding environment.

Frequently Asked Questions

1. Can HEPA filters be washed and reused?

Well, a HEPA filter can definitely be reused, if you can clean or wash it following the right way.
If you really want to reuse your HEPA filter, you have to gather in-depth knowledge regarding
how to wash and reuse HEPA filters

2. How do I know if my HEPA filter is dirty?

If you find out dust or debris on your HEPA filter or if the filter seems to have a greyish color, it means that your HEPA filter is dirty.

3. How long do air purifier filters last?

In one word, I would say that it depends.
Depending on your HEPA filtration technology and system, your HEPA air filter may last from 6 months to even 2 years or 3 years.

Final Words

At present, there can hardly be found a homeowner who doesn’t want to purify the air quality in the home.

In order to purify the air quality of your room, you definitely need to get one of the best HEPA air filter air purifying machines. And, when you have a good quality HEPA filter air purifier, the next thing that will pop up in your mind would like how often should you change HEPA filter in air purifier or when to change HEPA filter air purifier.

In the above discussion, I have tried to explain everything you need to know about how often HEPA filter needs to be changed.

Still, if you have anything more to know regarding this subject matter, you can send me a direct message.

This is all for TODAY.


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