The Best Filterless Air Purifier for Your Home

When we think about air purifiers, we think about air filters. We think about the hassle of buying replacement filters, storing them, cleaning them, and changing them out.

What if there was another way?

What are Filterless Air Purifiers?

Filterless air purifiers are just as they sound. They purify the air without the need for a filter. This means less hassle for you and no need to purchase (often costly) filters.

There are many ways in which filterless air purifiers filter the air, and we will talk about them in detail later in this article. All you need to know now is that filterless purifiers work just as well as ones with filters.

The Best Filterless Air Purifiers

Airfree Iris 3000

The thermodynamic core technology system uses heat to kill harmful microorganisms in the air. This includes mites, bacteria, viruses, pollen, and pet dander.  The device also does not spray the air, so there is nothing that can cause your allergies to flare up.

The Airfree Iris 3000 is a quiet device that you can have running all day and all night. The smart design also means that it fits any space and decor without looking out of place. The built-in night light makes it perfect for kids as well as adults.

The only negative here is that you cannot tell that it is working. With filtered air purifiers, you can see the dirty filter and know to replace it. With this device, there is no residue, and you have to trust the process. This can be both a blessing and a curse.

Negative Ion Air Purifier

For a more affordable option, this air purifier is a perfect choice. It uses negatively charged ions to attach to airborne pollutants, creating extra weight that drags them to the floor. It is particularly effective for smoke, pollen, dust, and odors.

There are three modes to choose from, including a sleep mode (so you can have it running all night). And even when it is running in the other modes, you will find that it is very quiet.

This is a smaller unit, so it is best suited for smaller rooms.

Airfree T800 Filterless Air Purifier

Airfree makes excellent air purifiers, and this is another one that gets the job done. Again, it uses heat to kill off the airborne organisms that can be drifting around in your home, and it does not emit any harmful sprays, ions, or UV light into your rooms.

The machine is completely silent to run without any noisy fans, so it can be used in the bedroom too, and it is affordable to run. Not only will you not need to buy new filters for it, but the lack of a fan means less power consumption.

While the manufacturer information does state that the heat used to kill the airborne particulates will not warm up a room, some customers have reported that rooms are a little hotter when the device is in use.

How Do Filterless Air Purifiers Work?

There are a few ways that filterless purifiers work, including heat, ions, electrostatic, and UV.


Heat can kill off a lot of harmful bacteria, and that is what happens in these air purifiers. The air passes through the device and is heated. The harmful bacteria in the air are killed off, and the air that comes out the other side is cleaner and less harmful.


Two plates in the purifier are electrically charged, and the air that passes through them is purified. The first plate charges the molecules, and the second plate acts as a magnet to attract them. The air that is left is cleaned of the harmful particulates.


This works in a similar way to ionizers. An electrical charge is created, and that charge takes out all the harmful airborne particles. Ions are also released to sanitize the air further.


UV light can eradicate harmful airborne particulates. When the air comes into contact with the UV light, it will kill viruses, bacteria, germs, and mold. UV light is often used to sanitize in hospitals and is very cost-effective as it does not use a lot of power.

Do Air Purifiers Still Work Without Filters?

As you can see above, filterless air purifiers work just as well as purifiers with filters. There are many different methods that filterless air purifiers utilize to achieve clean air.  As is the case with filtered air purifiers, you will find some that are better than others, and we always recommend investing in quality. You will save money in the long run.

Benefits of Filterless Air Purifiers

The main benefit of a filterless air purifier is the cost. You do not need to replace your filters, so you are not constantly paying money to keep your device operational. 

Some purifiers will come with washable filters, but you still have to spend time cleaning the filters. You do not need to with a filterless air purifier. As there are fewer moving parts, the repairs and maintenance are often cheaper too, as long as you keep on top of regular cleaning and maintenance.

Because there are generally no fans in a filterless air purifier, they are often a lot quieter. If you want to use one in a bedroom or workspace, that silent operation can be a big benefit.

And, the savings don’t just stop at replacement filters and maintenance. Because filterless air purifiers generally draw less energy, you will save money on your utility bills over time.

The Downsides

One big drawback is not knowing if they work. Of course, filterless air purifiers do work, but it is a lot harder to recognize that they are working (of course, you will breathe easier, and that is a big sign). With filtered air purifiers, you can see the filter become dirtier as time passes, and you know that it is trapping the particulates. You do not see the evidence with a filterless air purifier.

If you take the very best True HEPA filter, it will trap more harmful airborne particles than a filterless air purifier will. If you have serious respiratory issues, a filterless purifier may not be for you. For general air cleaning, they will work fine.

When you are buying a filterless air purifier, look out for ones that emit ozone into the air. When particles are charged, the device can create ozone as a by-product. If you struggle with lung issues or allergies, this can exacerbate your condition.

What to Look for in a Filterless Air Purifier

Area of Coverage

The most important thing to think about is the size of the room that the air purifier is going to be in. If it cannot handle the entire room, then there is no point in buying it.


Some air purifiers are noisier than others. While filterless air purifiers are generally quieter than other air purifiers, noise should be a concern if you are placing it in a work or sleep area.


If you suffer from any respiratory issues or allergies, ozone can make them worse. Look for a filterless air purifier that does not emit ozone.


Filterless air purifiers are very economical when it comes to how much energy they use. However, if you are going to be running the air purifier 24/7, look for one that does not consume much energy.


It is always a sign that manufacturers have trust in their products when they offer a lengthy warranty. Look for a warranty that covers you for at least a year, and always read the fine print so that you know what is covered.


If you like simplicity, go for that. But, if you want to be able to move the air purifier from room to room, or you want to change the intensity throughout the day, look for an air purifier that has additional features. Some extra features include LCD displays, lights, backlights, timers, and different modes of operation.

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Do Filterless Air Purifiers Release Ozone?

Some filterless air purifiers do, so always make sure to check for that if it will be an issue for you. If you do not have any allergies or issues, you should be fine with any filterless purifier.

Do Filterless Air Purifiers Remove Odor?

Yes, some do. Just like regular air purifiers, some are built to remove smaller particles, including the ones that remove odors. Check the label to find the best purifier for you.

Are Filterless Air Purifiers Safe Around Children and Pets?

Yes, they are. Unless your children or pets have any additional health issues or allergies. If that is the case, look out for purifiers that emit ozone.

Can I Leave a Filterless Air Purifier On All The Time?

Yes, you can. 

Will Heat Sterilization Increase Room Temperature?

As such a small area is being heated at a time, it should not lead to an increase in the heat of an entire room. Of course, larger air purifiers and ones that are left on all day can cause a slight increase.

This page last updated January 1, 2023