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In this in-depth buying guide, we are going to review the best air purifiers for mold. These air purifiers are optimized to remove mold spores from the air.
Mold spores are how mold reproduces. The tiny structures float into the air, growing into mold on any moist surface they fall on.
When breathed in, they cause allergic reactions, worsen asthma symptoms and result in allergy-like symptoms even in people without any allergies.
If you have asthma, mold spores can trigger attacks.
Read on for reviews of the best HEPA air purifiers that will eliminate mold spores from your home.
If you are looking for a general use air purifier that can tackle all kinds of allergens and pollutants, read our HEPA air purifier buying guide for the best recommendations.
With 5 levels of filtration, mold spores don’t stand a chance against the SilverOnyx Air Purifier. Neither does smoke, pet dander, allergens and odors.
The purifier complements its three filters–a mesh pre-filter, a true HEPA filter and an activated carbon filter –with a negative ion generator and UV sanitizer to ensure your indoor air is completely free of harmful microbes and allergens.
It’s a great choice if you are struggling with mold, pet dander or dust in your home.
The purifier can adequately cover medium and large rooms of up to 500 square feet.
The ion generator and UV sanitizer functions are optional. You can turn them on or off.
The air purifier can cover rooms of up to 500 square feet in size.
The purifier displays how much life is remaining in your filters. When it is almost time to replace them, you’ll get a reminder.
When set to auto mode, an integrated sensor measures the amount of particulate matter in the air and automatically adjusts airflow to increase or decrease the rate of filtration.
If you start cooking something for instance, you’ll notice that airflow goes up to filter out the odor and smoke faster.
You can see the PM (particulate matter) reading yourself on the display along with the current fan speed.
If you don’t want the purifier to adjust airflow automatically, you can choose manually from one of the five airflow speed levels.
The higher levels (4 & 5) are ideal when you need to get rid of something in the air quickly. The mid-level (3) is the best for everyday purification. The lower fan speed levels (1 & 2) are ideal for use at night when you want to reduce the noise level.
Press sleep mode and the purifier automatically reduces fan noise and turns off the lights to help you sleep better.
The SilverOnyx purifier is a great all-round purifier with its only limitation being that you cannot use it in a very large room.
If you are looking for a purifier to use in a large open-style living area or which can remove allergens in multiple rooms, I recommend the Alen BreatheSmart we’ve reviewed below.
Alternatively, buy a couple of these purifiers to provide complete coverage.
This air purifier is great for: Anyone looking for an affordable HEPA air purifier that can remove mold spores and other allergens from a small or mid-sized room.
Avoid if: You are looking for an air purifier that can adequately cover a space bigger than 500 square feet.
If you are looking for a cheaper air purifier for a smaller room, try this 28” tower purifier from GermGuardian.
It boasts three levels of air purification: a true HEPA filter, a charcoal filter, and UV-C light sanitization.
The purifier covers small rooms of up to 180 square feet in size. If you want to use it in a bigger room, there’s a 2-pack option.
You can select between three fan speeds to vary airflow from the purifier. Higher airflow is ideal when you want to purify the air faster. Lower the airflow at night to make the fan quieter.
Note that this air purifier doesn’t have an auto mode that varies airflow automatically. It will run on the fan speed you’ve selected.
Nor does it have a sleep mode that automatically lowers fan speed at night. You’ll have to select a lower speed manually.
The HEPA filter and charcoal filter are combined into one filter. So when it comes time to replace them (the manufacturer recommends replacement after 6-8 months), you only need to change a single filter.
The biggest limitation is coverage. It’s rated for rooms of up to 180 square feet. It’s not ideal for large and open-concept rooms.
The air purifier doesn’t have a timer, a basic feature in almost all air purifiers. You cannot set it to turn off automatically after some time.
A couple of other missing features include auto mode and sleep mode.
There are also several customer complaints about the durability of the purifier. They say that it stopped working or started malfunctioning after a few months.
Luckily, the manufacturer provides a 5-year warranty. They’ll gladly repair or replace your unit if it develops issues.
This air purifier is best for: Anyone looking for a budget air purifier that can remove mold and other allergens in a small room.
Avoid if: You want a purifier that can cover a large room.
The Coway Mighty air purifier Mighty air purifier costs more than most of the other air purifiers we have reviewed.
But it also purifies the air more effectively (it has a higher clean air delivery rate), has more features and honestly, it looks a lot sleeker than the others.
(Clean air delivery rate or CADR is the measure of an air purifier’s ability to remove different types of particles from the air)
The air purifier is designed for medium-sized spaces of up to 360 square feet. It’s great for apartments, bedrooms and average-sized living areas.
To make sure your indoor air is completely clean and safe to breathe, it uses a 4-stage purification process starting with a pre-filter and ending with an ionizer.
The air quality indicator is a nice touch as is the filter replacement indicator.
You can select one of the three fan speed levels depending on how much airflow you want. A higher airflow means faster air purification while a lower fan speed means less noise.
You can also set the purifier on the auto mode. Using a built-in sensor, it will determine how polluted your indoor air is (by measuring the level of particulates) and adjust fan speed automatically.
When the sensor doesn’t detect any allergens for 30 minutes, the air purifier automatically switches to the eco mode. The fan completely turns off to save energy.
The timer automatically switches off the air purifier after the set amount of time. Timer options are 1, 4, 8 and 12 hours.
Don’t worry about adding a reminder to your calendar. The air purifier will conveniently prompt you when it’s almost time to replace the filter.
The main issue customers mentioned is that the fan is pretty loud when set at the highest speed. You can hear it from another room.
But this is to be expected. Most air purifiers are loud when the fan is running at the highest speed.
Luckily, you rarely need to select the highest speed. The first and second levels, which are much quieter, are good enough most of the time.
This air purifier is best for: Anyone looking for the best air purifierfor mold and other allergens like smoke, dust and pollen.
Avoid if: You are looking for a budget air purifier.
With its 1,100square feet coverage, the Alen BreatheSmart air purifier is great for large homes.
It’s bigger than your typical air purifier but they’ve at least made it pretty. It has a boxy modern design with a customizable front panel finish.
You can go all-white orgo with one of the warmer finishes including brushed bronze, rosewood or espresso.
Something else that you can choose is the type of filter you want. There are filters specifically for allergies & dust, pet dander & odors, smoke & chemicals and mold & bacteria.
Alen BreatheSmart is one of the most powerful portable air purifiers we have reviewed.
It covers rooms as large as 1100 square feet, making it ideal for open concept living areas, open design basements, large bedrooms and any other spacious indoor areas.
It purifies air using a HEPA filter in addition to 2 or 3 other filters (depending on which type of filter package you select).
It removes allergens like pollen, dust and smoke as well as bad odors andairborne chemicals.
You can customize your purifier to focus on specific impurities.
For instance, if what bothers you most is allergens and dust, there is a specific filter optimized to deal with them.
If you have pets that stink up the house, there’s another filter that is great at removing odors and pet dander.
In all, there are four filter options:
HEPA Pure: For allergens like pollen, dust and dander.
HEPA Silver: For mold, bacteria and light odors. Best option for removing mold spores.
HEPA Fresh Plus: For smoke and chemicals.
HEPA Odorcell: For strong odors.
Four fan speed settings vary how much air the unit sucks in. Higher speeds are louder but they clean up the room quicker. Lower speeds are great when you want to reduce how much noise the purifier produces.
But you’ll find the auto mode to be more convenient.
In this mode, the air purifier uses an infrared sensor to detect the level of impurities in the air. It then automatically adjusts fan speed depending on how dirty or clean the air is.
If you start cooking or someone lights a cigarette, you’ll notice that the purifier gets louder as it increases fan speed.
If the air stays clean for a while, it lowers fan speed to reduce noise and save energy.
For its size, the Alen BreatheSmart is surprisingly quiet.
That is thanks to their WhisperMax Technology that keeps noise levels down even at the highest fan speed setting.
At the lowest speed, it is almost silent.
You can tell how dirty your indoor air is by checking the light on the air purifier. It changes color depending on the air quality.
Red means dirty, yellow means medium-clean and blue means clean.
The main downside is the price.
The Alen BreatheSmart is one of the most expensive portable air purifiers. But it’s worth every penny.
It’s more powerful than most other air purifiers, has more features and scores more points on design and style.
One issue though that you might want to keep in mind when buying this air purifier is the size. Unlike most portable air purifiers, you cannot place this in a table or on a bedside cabinet.
But I don’t think this will be a big deal for the size of rooms it’s meant to be used in.
This air purifier is best for: Families looking for a high performance air purifier that can cover a large room.Avoid if: You are looking for a budget air purifier or you want an air purifier for a small room.
The Honeywell HPA300 delivers a great suite of features and large room coverage for a decent price, making it our top value pick.
With an air change rate of 5 times per hour, it’s works hard to keep allergens and pollutants out of medium and large rooms.
The design is not the most attractive but it’s forgivable considering the affordable pricing. The excellent air purification performance also makes up for it.
The purifier has only two filtration stages. This is on the lower side compared to other air purifiers includingmany cheaper ones that have at least 3 stages.
But while the HPA300 has only two stages, it actually has four filters: one carbon pre-filter and three HEPA filters.
So it purifies air just as well, if not better, than some more expensive models.
The carbon pre-filter traps large particles like dust and pet fur. It also filters out unpleasant household odors.
The HEPA filters trap smaller allergens like smoke, pollen, dust and mold.
The HPA300 is rated for use in rooms of up to 465 square feet. This covers most medium size and large rooms.
If you want an air purifier for a spacious bedroom, an open concept living area or any other large space, the HPA300 is perfect.
There are four fan speed settings. But instead of selecting level 1, 2 and 3 or low, medium and high like in most air purifiers, the HPA300 uses more intuitive labelling.
The four levels are labelled as:
Germ – the lowest and quietest level
General Clean – the medium setting. Perfect for everyday use.
Allergen –the second highest setting. A bit noisy but it clears the air fast.
Turbo– the highest setting. Noisy but powerful; ideal for quick cleanup of polluted air.
Unfortunately, there is no auto mode so you have to guess which level is right for a particular moment.
The ability to dim indicator lights is one feature many air purifiers, annoyingly, neglect to include. Thankfully, the HPA300 has a dimmer button to make sure you sleep without distractions.
It also comes with a timer that you can set for 2, 4 or 8 hours.
By far the most frequent complaint from customers is the price of the replacement filters. You’ll save money on the air purifier itself but spend more on replacement filters.
What makes it worse is that the carbon pre-filter doesn’t last long – just 3 months. This is probably because the air purifier doesn’t have a washable pre-filter like in most air purifiers.
Something else missing is auto mode, which if present,would conveniently set the ideal fan speed depending on the air quality.
The lack of auto mode also means there isn’t an air quality indicator.
Another issue raised by many customers is the noise level at the high (allergen) and turbo setting. Thankfully, you only use these levels occasionally when allergen levels are particularly high.
This air purifier is best for: Families looking for a powerful but affordable HEPA air purifier for a medium size or large room.Avoid if: You are looking for an air purifier that is cheap to maintain. The HPA300’s pricey filters make it more expensive to maintain.
It’s not uncommon to find air purifiers with replacement filters that cost half as much as the air purifier itself. After 2-3 replacements, you’ll have spent more on filters than you did on the air purifier.
This is made worse by the relatively short filter life of most HEPA air purifiers. You have to replace the main HEPA filter every 6 months or annually.
But if you get the Oransi Finn air purifier, you can go as long as 2 years before you need to get a new HEPA filter.
The extended filter life makes Finn slightly cheaper to maintain compared to other air purifiers.
I say ’slightly cheaper’ because the expensive replacement filters almost cancel out any savings you make by having a long life filter.
There are two primary filters in the Oransi air purifier.
Carbon pre-filter: captures dust, pet hair and other large allergens. Also filters out light odors from indoor air.
HEPA filter: Captures smaller allergens up to 0.3 microns in size.
In addition, an integrated UV lamp targets airborne bacteria and viruses to enhance the quality of your indoor air.
The air purifier also comes with a negative ion generator that freshens up the air and makes it easier for the filters to capture allergens and pollutants.
The air purifier is good for most medium size rooms of up to 400 square feet.
Depending on room size and air quality, you can select from three fan speeds.
Increasing fan speed increases the performance of the air purifier, allowing it to draw in more air and remove allergens quicker.
Unfortunately, there is no auto mode. It also doesn’t have an air quality indicator. Both features rely on an air quality sensor, which the Finn air purifier lacks.
The first two fan speed settings are fairly quiet. You can easily watch a movie or fall asleep with the air purifier next to you.
The highest fan speed is a bit noisier but it’s just a background hum that most people get used to in a few days.
You can still watch a movie or sleep with the fan speed turned to the highest setting.
Most HEPA filters last about a year. Oransi says their Finn HEPA filter can last up to 2 years.
As many customers have noted, that’s a bit of an exaggeration. The filter will last more than a year but won’t hit the 2-year mark unless your indoor air is clean most of the time.
To make sure you get the longest lifespan possible, the manufacturer recommends vacuuming the filters every couple of months.
Note: The pre-filter has a much shorter lifespan of 4-6 months.
This almost cancels out the price advantages of the long filter life.
Even worse, you cannot buy individual filters. Oransi only sells a kit with 3 pre-filters and 1 HEPA filter.
The blue light on top of the air purifier stays on all the time. If you are one of those people who love a completely dark sleeping environment, it’s going to be annoying.
This air purifier is best for: Anyone looking for an affordable air purifier with a long filter life.
Avoid if: You want a powerful air purifier for an extra-large room (over 400 sq. ft.).
All the air purifiers we have reviewed are all good for allergy sufferers. They do a great job removing allergens and pollutants from indoor air.
But the AeraMax does an especially excellent job keeping the room allergen-free. It even has a special mode for allergy season.
If you or someone at home has allergies or a respiratory condition like asthma, we highly recommend the AeraMax 300.
It’s good for medium and large rooms of up to 600 square feet.
The manufacturer, Fellowes, labels the AeraMax 300 as a 4-stage air purifier.
Strictly speaking, however, the air purifier has only two filters: a carbon pre-filter that captures large particles and light odors and a HEPA filter that filters out allergens as small as 0.3 microns.
The third stage is an antimicrobial treatment on the HEPA filter.
However, this treatment does not filter air. It only prevents the development of bacteria and mold on the HEPA filter, which would contaminate indoor air.
The fourth stage is a negative ion generator. As with the antimicrobial treatment, the ionizer does not directly filter air. It just makes it easier for the filters to remove airborne pollutants.
You can select from four fan speed settings to vary the air purifier’s performance and noise level. Turbo, the highest setting, cleans air the quickest though it’s quite loud.
If you don’t want to keep changing fan speed, leave the air purifier on auto mode.
It will automatically select the best fan speed setting based on how dirty or clean your indoor air is. It uses an integrated sensor to detect the level of pollution in the air.
Using the sensor, the air purifier shows you the state of your indoor air using a color-coded light. Red means indoor air is dirty, amber means it is getting cleaner and blue means it’s clean.
During peak allergy season when there are allergens everywhere, turn on the Aera+ mode to boost the air purifier’s performance.
It will work harder to purify more air and keep the room allergen-free.
The biggest complaint from customers is the whining sound the fan makes even at lower speeds.
The high-pitched noisecan be quite annoying especially at night.
Luckily, you can stop it but it means giving up the ionizer. Some users discovered that the noise was present only when the ionizer was on.
But even with the ionizer off, the fan is still quite loud at speed level 3 and 4.
Youcannot turn off the indicator lights, which is annoying if you prefer a completely dark bedroom.
The only alternative is to drape a cloth over the unit, which interferes with airflow.
This air purifier is best for:Large and medium size homes with allergy sufferers.
Avoid if: You can only sleep in a totally dark room. The light on the AeraMax 300 doesn’t turn off.
Excess moisture is the key cause of mold in homes.
Other factors like warmth and presence of a food source (e.g. wood) also affect the occurrence and growth of mold. But since these are almost always present in most homes, moisture is the most important factor.
Excess moisture or dampness can be caused by several things including:
Mold thrives best in dark and damp locations around your home.
There are three mold classifications.
Allergenic mold that causes and aggravates allergic reactions.
Pathogenic mold that causes various health problems.
Toxigenic or toxic mold that produces toxic substances that are dangerous or even deadly to humans.
Within these three groups there are around a dozen types of mold common in homes. They include Trichoderma, Stachybotrys and Acremonium a particularly toxigenic type of mold.
Aer Industries, a major maker of water damage restoration equipment, hasa handy list of the 12 most common types of mold and the dangers of each.
Because mold thrives where there is moisture, check areas where there’s likely to be dampness. Some obvious places include the bathroom, basement, around plumbing joints and connectors and the kitchen.
Other places to check are:
The health effect of mold depends on your level of sensitivity to mold and the presence of other health conditions such as asthma or a weak immune system.
It also depends on what kind of mold it is.
Some types of mold have no effect at all, others cause an allergic reaction while others can be downright deadly.
Take Stachybotrys chartarum for instance.
More commonly known as toxic black mold, this species of mold can cause internal organ damage, mental impairment, difficulty breathing, vision problems and death.
Luckily, mold rarely causes such severe reactions.
Most types of mold cause hay fever like symptoms including wheezing and coughing, nasal congestion, runny nose, throat irritation and sneezing.
Your eyes and skin may also feel itchy.Certain types of mold have been known to increase the risk of asthma in children.
There are two things you have to do to get rid of mold.
The first one is the hardest depending on what kind of dampness problem you are facing.
If it’s a small leak in your plumbing, fix it immediately. If the problem is too much condensation in the basement or garage, use a dehumidifier to lower moisture levels.
Also make sure there is enough ventilation around your home to prevent moisture buildup inside. Opening a window or two every morning should also help reduce condensation.
Make sure your upholstery, bedding and mattress are clean and dry. Air your mattress often to prevent moisture buildup.
Other dampness problems require calling a pro. For instance, a leaky roof or water coming in through the basement floor.
A professional will help you identify and solve the root problem.
Onto the second part.
Physically getting rid of the mold itself is easy. Spray some vinegar on it and leave it to sit for an hour then wipe the area with a moist cloth.
What aren’t so easy to remove are the mold spores that spread the mold around your house. Even a few mold spores can easily cause new mold growth.
You need to get rid of all airborne spores. The best way to do this is by using a HEPA air purifier.
HEPA filters are the only ones that can filter almost 100% of mold spores in the air, ensuring that new mold doesn’t grow.
A mold air purifier should have a HEPA air purifier. Period.
HEPA filters are the only ones that can trap the tiny mold spores.
A HEPA filter does a great job on its own. It can capture almost all the mold spores in the air passing through the air purifier.
If you want extra protection, look for an air purifier with a UV lamp.
UV irradiation kills bacteria, viruses and mold spores.
A good quality air purifier for mold should have at least two stages.
These include a pre-filter (usually a carbon pre-filter) and the HEPA filter itself.
Some air purifiers have three filters: a washable pre-filter for large particles, a carbon filter for odor and a HEPA filter for mold spores and other tiny allergens.
High-end air purifiers will usually have extra stages such as a negative ion generator and a UV lamp. These are not essential but they do improve air purification.
An air purifier that is too weak for the room you are using it in won’t be of much help. It will not be able to completely clear allergens and pollutants from the air.
It’s also not a good idea to get an air purifier that is too powerful for the room. It will waste a lot of energy, will make the room too cold and will dry out the air.
Always check the manufacture-specified coverage area before you buy an air purifier.
There are air purifiers for small rooms (under 200 square feet), for medium size rooms (200-400 square feet), large rooms (400-700 square feet) and extra-large rooms (over 700 square feet).
Typically, the pre-filter needs to be replaced every 4-6 months while the HEPA filter has to be replaced annually.
But some air purifiers offer a longer HEPA filter life of up to 2 years.
However, the actual filter life will vary depending on your home’s air quality. For instance, the filter might last only a few months if there have been wildfires in your area.
That’s why it is important to buy an air purifier with a filter replacement alert or indicator. It takes the guesswork out of determining when to get a new filter, ensuring your air purifier is always performing at its best.
All air purifiers have multiple fan speed settings, usually 3 or 4.
This lets you select the best setting for different situations. For instance, you crank up fan speed if your eyes or nose start feeling itchy and lower it when you want to sleep to reduce noise.
Instead of having to change fan speed every time the air gets dirty, get an air purifier with an air quality sensor.
The sensor detects pollution levels in the air and automatically selects the best fan speed setting. You can just leave the air purifier on auto mode and it will keep your indoor air clean 24/7.
As a bonus, air purifiers with this sensor also have an air quality indicator, a small light that changes color to tell you how dirty or clean your air is.
Over time, you learn which activities pollute your air the most, which can help you keep your indoor air cleaner.
A mold air purifier doesn’t just remove mold spores.
It will also capture other allergens like dust, pollen and pet dander and reduce smells from pets, cooking and smoking.
Even after the mold is gone, you’ll still benefit from having the air purifier in your home.
Yes, they do. HEPA air purifiers capture mold spores in the air, preventing them from developing into mold.
No, they don’t. The negative ions produced by an ionizer stick to mold spores and other allergens, causing them to fall on the ground and stick to walls.
But the mold spores are still around and can cause mold growth.
A HEPA filter in contrasts traps the mold spores in the filter, ensuring they cannot attach to other surfaces and grow into mold.
It depends on your needs. Our top recommendation is the SilverOnyx Air Purifier with True HEPA, Carbon Filter, UV Light and Ionizer.
See our reviews above for our top picks for large homes, small homes and homes with allergy sufferers.
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