Top 7 Best Air Purifiers for Mold and Mildew (**2021 Review**)

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Home > Product Reviews > Mold Products > Top 7 Best Air Purifiers for Mold and Mildew (**2021 Review**)

Mold has been a problem since the dawn of time. Egon, from the original Ghostbusters, who told their secretary, “I collect spores, molds, and fungus,” is probably the only person in the world who actually likes mold. The rest of us can’t stand it, and rightly so.

To stop mold growth, you need a mold air purifier.

In this Pest Strategies review you’ll learn:

  • What air purifiers are
  • How air purifiers work
  • What you can expect from air purifiers
  • Which air purifiers are the best

Molds spread by releasing airborne spores that float through the air until they find a wet or damp surface. There, they land and more mold growth begins, starting the cycle all over again.

Mold exposure presents an ever-present threat to human health. It can cause and/or worsen allergic reactions, and in the case of Stachybotrys chartarum, can even lead to death in a worst-case scenario. Obviously, we’d like to avoid this at all costs. Air purifiers can help.

Reviewed By:
Ed Spicer

Ed has been working in the pest control industry for years helping 1,000's of homeowners navigate the world of insect and rodent management. He manages Pest Strategies now helping homeowners around the world!

Best Overall
Overall Rating
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Medify MA-40W V2.0 Air Purifier

  • Medical Grade Air Filter
  • Catches ultra-fine particles and cleans 1,600 sqft in one hour
  • Quiet mode for night time and lockable making it child safe

Alen BreatheSmart Classic Air Purifier

  • Cleans air every 30 minutes
  • Uses WhisperMax technology
  • Contains HEPA-Silver filter

Blue Air Blue Pure 2 Air Purifier

  • Advanced technology to filter out 99 percent of airborne pollutants
  • Reduces household odors
  • Quiet operation

Molekule Air Large Room Air Purifier

  • Uses active oxygen to kill bacteria
  • Uses PECO technology
  • Portable so you can use it at home or on the go

SilverOnyx Air Purifier

  • 5 levels of filtration
  • Combines filters and ion generator
  • 5 fan speeds

GermGuardian Air Purifier

  • UV light to kill airborne viruses
  • Double filtration system
  • Filters 99 percent of mold and dust

AeraMax 100 Air Purifier

  • HEPA and activated carbon filters
  • Automatically detects particles
  • PlasmaTrue technology

What Are Air Purifiers?

Airborne particles including airborne mold, mildew, pet dander, dust mites, and other allergens can combine to create air pollution and a musty smell in your house. The air quality will suffer as the musty odor increases.

All of those floating particles are winding up in your lungs, which is about as unhealthy as you can get. You can restore quality air in your house by removing these irritants, which is where air purifiers come into play. They are essentially air cleaning devices.

Read more: Is that smell in your home air pollution or stink bugs?

Air purifiers are generally rated by their coverage area, or how many square feet of clean air they can produce in any given room size. They are also rated by their filtration system, what kind of air filter, filter life, and how often filter replacement should take place.

Some air purifiers also produce negative ions which are beneficial to human health. It’s important to note that an air purifier is not a dehumidifier, but it doesn’t hurt to use them in conjunction with each other.


How Do Air Purifiers Work?

Air purifiers work by filtering air as an internal fan draws air into the purifier, filters it by one of several different means then pumps it back into the surrounding air again.

The best air purifier for mold and allergen removal will utilize a true HEPA (high-efficiency particulate absorption) filter. True HEPA filters are high-efficiency filters that must stop 99.9% of all particles that are 0.3 microns in diameter.

A true HEPA filter is one that meets the high-efficiency particulate absorption standards, which are lofty. Other filters may be similar to HEPA filters, but do not achieve the same standards. Other filters can also be effective, but are not as high-quality as a true HEPA filter.

The filter captures and holds airborne particles as a fan forces indoor air through the filter. The higher the fan speed, the greater the chance the force of the air current will cause particles to slip through the filter, making this one instance where faster isn’t good.

Replacement filters are required on a regular basis as they become laden with captured particles that inhibit airflow through the filtration system.

The best air purifiers for mold will have an electrically charged plate that will collect mold and pollen particles from the air. Airborne mold spores will be stuck to the plate, which will need to be cleaned periodically.

They may also include an ionizer, an ion generator, that will produce electrically charged ions. These ions then bond to airborne particles floating in the air. The resulting electrostatic charges them to cling to surfaces in the room such as ceilings, drapes, and walls.

The U.S. Environmental Protection Agency (EPA) warns against using ion-generating purifiers because they can actually increase the risk of inhaling unwanted particles.

Finally, air purifiers for mold often include a UV light. Rays from UV light kill bacteria, mold, and spores.

Air purifiers that utilize two or more of these filtration methods are known as multi-stage filtration systems.


How Do You Find The Best Air Purifiers?

Short answer: for a buying guide, you come to Pest Strategies and take advantage of our years of experience out in the field.

Long answer: our staff has many years of real-life experience with pest control and mold removal. Crawling under a house to kill mold with a 1-gallon pump-up sprayer isn’t nearly as much fun as it sounds, but we’ve done it.

Read more: Safest respirators to wear while killing mold

Whether the mold is under the house or under the sink, killing it once it’s taken root is a hard, dirty job. It taught us – the hard way – that an ounce of prevention is worth a pound of cure. The best way to stop a mold problem is before it happens.

In an effort to save our customers some money, licensed pest control technicians have had to become familiar with air purifiers so we can recommend the better ones to people.

You may be familiar with brands that are well-marketed, like Germguardian. But good marketing doesn’t make a good product.

Over the years we’ve seen the brands and models that didn’t work (because we were called out to spray for mold) and the ones that did. So, let our experience be your guide.

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Are Air Purifiers Effective?


How effective they are will depend on which one you get. That’s why we publish articles like this, to guide you to the best ones. People usually want to save money and we don’t blame them, but in this instance, the old saying, “You get what you pay for,” definitely applies.

If you skimp on the air purifier, that’s exactly the kind of results you’re going to get from whichever one you buy. Now, depending on the size of the room or house you’re using the air purifier in, you might wind up with a smaller, less expensive unit, but always go for the best.

In other words, you’ll get the best results by matching the air purifier to the room. High quality doesn’t have to cost an arm and a leg if you only need an air cleaner for 100-200 square foot room.

What is high quality? Well, there are a number of ways to measure air purifier quality. HEPA is one common method. Another is Clean Air Delivery Rate (CADR). CADR is intended to measure stand-alone purifiers, like the ones that we rated. However, they aren’t always the most reliable.

For one thing, CADR only measures the first 20 minutes of a purifier’s performance. This means that the long-term performance of a purifier isn’t taken into account. CADR also doesn’t factor in ultrafine particles, which make up 90% of air pollution.

When determining the efficacy of an air purifier, base your decision only partially, if at all, on the CADR measurement.

How To Use An Air Purifier

Every air purifier should fit the room it’s in. A large room would need a large-capacity air purifier while a smaller room would need one with a smaller capacity. The location is equally important though.

If you place the unit in the corner, it may keep you from tripping over it but it won’t do much for mold removal. The best air purifier is one that has room to work. Good airflow is important to remove allergens and achieve the best clean air delivery rate. Therefore it needs to be centrally located as much as possible.

The furniture arrangement in each room will dictate the exact placement but if you can position it near the coffee table or other pieces of furniture, it will keep it mostly out of the way but still enable it to circulate the air in the room through its filters.

Another consideration is the noise level from the purifier. The fan inside will create a certain amount of background noise during normal operations. Pay close attention to any quiet operation mode or modes of operation. The exact decibel level is rarely mentioned in the description so you’ll have to look closely at what it does say.

If you’re buying your purifier from Amazon, check the customer reviews. Sometimes you can find where other buyers have commented about the noise and their first-hand experience can be valuable to your decision-making.

Are Air Purifiers Safe Around My Pets And Children?


Air purifiers can assist in keeping children healthy, especially those with asthma or mold allergies. Many of them not only remove tiny particles, allergens, pet dander, and molds from the air and pet hair, but they also clean the air of unsavory odors that trigger an allergic reaction in your children.

Aside from the normal caution you should take around any household electrical appliance, air purifiers are safe around your pets and children. Just don’t let your pet sleep right in front of it as their hair will get pulled in and clog the filters.

Best Air Purifiers Reviewed

As a quick recap, here are the 7 air purifiers we looked at.

  1. Medify MA-40W V2.0 Air Purifier
  2. Alen BreatheSmart Classic Air Purifier
  3. Blue Air Blue Pure 2 Air Purifier
  4. Molekule Air Large Room Air Purifier
  5. SilverOnyx Air Purifier
  6. GermGuardian Air Purifier
  7. AeraMax 100 Air Purifier

Our #1 pick went to the Medify MA-40W V2.0 Air Purifier, but some of the others might be more suited to your needs.

Final Thoughts On Air Purifiers

As the square foot capacity for air purifiers diminishes, so does the cost. In some cases, it might actually be best to buy two smaller units instead of a single larger one, or even three small ones.

On the larger units, the filters are more robust and don’t have to be changed as often as they do on the smaller purifiers.

If you need exceptionally clean air for a sick or allergic child though, a larger model might be best since they will generally capture more particles out of the air, especially our top choice, the Medify MA-40W V2.0 Air Purifier.

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Medify MA-40W V2.0 Air Purifier

For large rooms or small houses, this is the true HEPA air purifier to get. The Medify MA-40W also goes 100 times beyond the normal HEPA standards. It catches ultra-fine particles down to 0.003μ in size.

It has a tempered glass panel like your cell phone, easy to clean, won’t scratch like cheap plastic models, sleep and three fan speeds, 8 hr timer, night mode, and a child lock to make it safe for any room you want to put it in!

The Medify MA-40W model comes with a filter, so it is ready to get to work as soon as you unbox it. This filter has a life expectancy of about 2500 hours, which equates to approximately six months before you will need a new one.

Maybe most importantly of all, this air purifier is designed to eliminate volatile organic compounds (VOC). These include several chemicals in cigarette smoke.

The Good And The Bad

  • Long-lasting filters
  • Catches ultra-fine particles
  • Rated for up to 1600 square feet an hour
  • Mid ranged price tag
Overall Rating

Alen BreatheSmart Classic Air Purifier

Alen BreatheSmart Classic Air Purifier will handle rooms or small apartments up to 1100 square feet, completely cleaning the air every 30 minutes. It uses its proprietary WhisperMax technology to reduce the noise level below what most purifiers can attain.

The HEPA-Silver filter has an antimicrobial compound coating to inhibit bacteria and fungi growth. It also has an activated carbon filter that will particles of cigarette smoke, household chemicals, and others.

It has a laser smart sensor that detects airborne particles as small as 0.3μ. Based on its detection, it will self-adjust the fan speed to address changes in the indoor environment. It also comes with a lengthy, multi-year warranty.

This purifier also has customizable designer panels that come in different colors.

The Good And The Bad

  • Covers 1100 square feet
  • Extremely quiet
  • Smart controls
  • Excellent warranty
  • Customizable
  • Expensive price tag

Blue Air Blue Pure 2 Air Purifier

This premium air purifier from Blue Air uses the latest technology to reduce mold and other impurities in your home. It utilizes an advanced Swedish filtering design to eliminate nearly 99 percent of airborne impurities. It also cuts down on most household odors such as:

  • Cooking odors
  • Smoke
  • Pet odors
  • Garbage smells

It’s simple to operate — just turn it on and adjust it to the desired level. Also, it’s so quiet that you’ll hardly notice it’s there.

The Good And The Bad

  • Advanced technology to filter out 99 percent of airborne pollutants
  • Reduces household odors
  • Quiet operation
  • Energy-efficient
  • Takes a day or two to remove the packaging smell from the product

Molekule Air Large Room Air Purifier

Molekule Air Large Room Air Purifier will handle rooms or small apartments up to 600 square feet, and this device does not just collect what is in the air; it destroys it. Not only does the Molekule Air destroy air contaminants, but it does it at a whisper, so even right beside your bed, you can sleep while it works.

The Molekule Air uses Photo Electrochemical Oxidation (PECO) nanotechnology to destroy viruses, VOCs, allergens, bacteria & mold, candle aromas, and just about any other kind of irritant that could cause you problems.

It has a leather handle that makes it easy to move from one room to another as you see fit, and its filters all come with a warranty, so even if you get a faulty one, you have the support of the company in getting it replaced.

To top it all off, you can connect the Molekule Air to your wi-fi and control it via Bluetooth technology directly from your Android, iPhone, or similar device.

The Good And The Bad

  • Destroys instead of contains particles
  • Warranty on the filters
  • Portable
  • Very expensive

SilverOnyx Air Purifier

This SilverOnyx Air Purifier is for a room of 500 square feet, which reduces the cost but it still packs a lot of features. It features 5 different levels of filtration and comes in an attractive tabletop size that looks more like a decoration than an air filter.

It has a true HEPA filter, a combination mesh pre-filter, an activated carbon filter, a UV-C light, and an ion generator. All those stages are combined with an auto mode running off a smart sensor that automatically adjusts the airflow based on changing conditions.

The fan has 5 different speeds, each of which is incrementally louder than the previous one. The highest speed can be fairly loud. The filters need to be changed every 6 months.

The Good And The Bad

  • 5-stage filtration system
  • Attractive design
  • Small size
  • Inexpensive
  • High fan speeds are loud
  • Change filter every 6 months

GermGuardian Air Purifier

This GermGuardian four-in-one air purifier features a true HEPA filter that reduces up to 99 percent of the following:

  • Dust
  • Pollen
  • Mold
  • Pet dander
  • Allergens

In addition, the special UV light helps kill germs and airborne viruses. It also traps harmful particles utilizing a pre-filter combined with a HEPA filter for increased effectiveness.

The GermGuardian Air Purifier comes with three speeds and an optional UV light function. It’s super quiet on the lowest setting, and it covers up to 743 square feet.

The Good And The Bad

  • Filters 99 percent of mold and dust
  • UV light to kill airborne viruses
  • Double filtration system
  • Covers up to 743 square feet
  • May overheat with continuous use

AeraMax 100 Air Purifier

A semi-tall but slender air purifier,  the AeraMax 100 Air Purifier has a 4-stage filtration system, including a HEPA filter and activated carbon filter. It has a smart sensor to detect particles in the air and an auto mode so let it change fan speeds on the fly as circumstances dictate.

This inexpensive system is rated for small rooms that are 100-200 square feet and is quiet enough that it shouldn’t be noticeable except at the highest fan setting.

It has been given an antimicrobial treatment to protect it against odor-causing mildew, bacteria, and fungi. The proprietary PlasmaTrue technology creates an ionized field to further remove airborne pollutants and particles.

The carbon filter has to be changed every three months and the HEPA filter once a year.

The Good And The Bad

  • 4-stage filtration system
  • Smart sensors
  • Automatically adjusts itself
  • Change carbon filter every 3 months
  • Change HEPA filter every year
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