7 Best Smart Air Purifiers: Your Buyer’s Guide

smart air purifier


The air we breathe is the most crucial factor in our health. Yet, only recently has there been a way to monitor and control the air quality in your own home. Enter the smart air purifier. These home air purifiers combine standard HEPA and carbon filters with the ability to remotely to monitor any significant changes in your air quality. Let’s jump into our list of the best smart air purifiers for home use.

What Are the Best Smart Air Purifiers in 2021?

airmega 400s smart air purifier Amazon Customer Reviews
  • Alexa-enabled
  • Dual HEPA filters + activated carbon filter
  • Nearly silent
Price: $496.40 Shop at Amazon Shop now Read our review
blueair classic smart air purifier Amazon Customer Reviews
  • High 500 CADR
  • Alexa-enabled
  • Nearly silent
Price: $499.99 Shop at Amazon Shop now Read our review
winix hr1000 smart air purifier Amazon Customer Reviews
  • 5-stage filtration system
  • Versatile app
  • Nearly silent
Price: $215.99 Shop at Amazon Shop now Read our review
honeywell hpa250b smart air purifier Amazon Customer Reviews
  • Compact
  • Dual HEPA filters + activated carbon filter
  • Allergen sensor mode
Price: $599.66 Shop at Amazon Shop now Read our review
dyson pure cool smart air purifier Amazon Customer Reviews
  • Doubles as a fan
  • Built-in air quality monitor
  • Stylish
Price: $699.90 Shop at Amazon Shop now Read our review
germguardian smart air purifier Amazon Customer Reviews
  • Built-in UV light
  • Versatile app
  • Compact
Price: $168.99 Shop at Amazon Shop now Read our review
elechomes smart purifier Amazon Customer Reviews
  • Nearly silent on low
  • Built-in air quality monitor
  • Versatile app tracks air quality history
Price: $199.99 Shop at Amazon Shop now Read our review
Our Unbiased Reviews
  1. 1. Airmega AP-2015E(G) 400S Smart Air Purifier

    • Versatile Alexa-enabled app
    • Dual HEPA filters + activated carbon filter
    • Nearly silent on low
    • External circulation required to cover advertised area
    • In schedule mode, unit turns off after schedule is complete
    • App is tricky to set up

    The Airmega 400S is the most powerful smart air purifier we’ve come across, capable of efficiently cycling air through an area of 1,560 square feet.

    This figure is confusing, especially considering the 400S’ middling smoke CADR of 350 cfm. Generally, you want a unit with a smoke CADR at least 2/3 your room’s area so I would advise using additional fans to improve air circulation if you want to ensure clean air in an area this large. Still, you can’t argue with results, and dozens of users report successfully using this unit in large rooms. Plus, it is still among the best performers in smaller rooms.

    Another thing that helps the Airmega 400S stand out is the useful Airmega Mobile app, available for Android and iOS. If you can make it past the tricky setup, the app has some unique features, including an air quality tracker which gives you in the moment updates and historical data of your home air quality. You can also get outdoor air quality monitoring so you can anticipate when you’ll need to turn up the purifier’s power.

    You also have a solid scheduling tool, which can be intricately customized for each day of the week. If you don’t need to set a schedule, then you can use the app to cycle through the three different smart modes: auto, eco, and sleep. Auto mode adjusts the air filtration speed based on the room’s air quality level. Eco mode will automatically turn the system off when the air quality remains good for ten minutes, restarting once it detects significant pollution build-up. Sleep mode runs on your preferred setting until its light sensor detects darkness, at which point it reduces its fan speed to run quieter. You can also disable the LEDs if they bother you at night (they definitely bother me).

    Outside of smart modes, you also have manual low, medium, and high modes. Unless you have a good reason not to, it makes a lot more sense to use the smart modes. Another smart feature that the Airmega 400S touts is Alexa compatibility. Connect it to your home network, and then you can use any Alexa-enabled device with a microphone to dictate commands like Alexa, turn the air purifier on,” or “Alexa, increase the air purifier’s fan speed.”

    The 400s has a built-in filter lifespan indicator on its control panel, and you can also get filter replacement notifications via the app. This air purifier has a washable permanent pre-filter, which you can clean once a month or so to extend the lifespan of your air filter. The replacement Max2 filters can be fairly expensive, but they include both a new HEPA filter and an activated carbon filter. They need to be replaced every twelve months, which is standard for most air purifiers of this size.

    This is a cost you can get used to seeing for any air purifier, though. Considering the power that the Airmega 400S packs, it is well worth the annual expense for clean air.

    Dimensions: 22.8 x 14.8 x 14.8 inches
    Weight: 24.7 pounds
    Smoke CADR: 400 cfm
    Max room size: 1,560 square feet
    Noise: 22-52 dB(A)
    Average filter replacement: 12 months
    Warranty: 5-year limited

  2. 2. Blueair Classic 605 Air Purifier

    • High 500 CADR ensures max air turnover
    • Versatile Alexa-enabled app
    • Nearly silent on low
    • Large footprint
    • Short filter lifecycle
    • Does not ship with an activated carbon filter

    The Blueair Classic 605 may not look like anything fancy, but it is one of the highest rated smart air purifiers around, with impressive specs to match. With a CADR of 500 cfm, the bulky Classic 605 has no trouble turning over the air in its estimated max room size of 775 square feet. Its fans are positioned to absorb air from beneath the unit, and then disperse it in all directions, ensuring an even distribution of clean air throughout the room.

    This smart air purifier has three standard performance settings: low, medium, and high. On the lowest setting, it is among the quietest units we reviewed, granted, it performs at a much slower rate in this mode. To strike a balance between noise level and performance, you can set a custom schedule using the Blueair Friend app. As is the case with most Wi-Fi devices, the setup can be a little tricky depending on your phone’s settings.

    Once you get it set up, though, you can use the app to perform a number of functions. The most useful feature is the ability to program a schedule to fit your individual needs. Some choose to turn the fan high at night for ambient white noise and turn it low when they aren’t home to benefit from the air purification. Others prefer to keep the fan low at night for a peaceful environment, then turn it up high so it gets the heavy filtration done when you aren’t around to hear it. Either way works.

    The app also allows you to disable the LEDs on the unit. Most of these are covered by a clever lid anyway, but they can still be distracting at night. You can also set up a child lock or remotely change your fan speed. If you would like to dictate commands to your phone or smart speaker, you can connect your Blueair 605 to Alexa, or you can use IFTTT to integrate it into a smart home setup.

    One thing the app lacks is a notification system for when you need to replace the air filter. Granted, there is a light built into the unit that will inform you when it is nearly time to replace it, and that’s good enough for me. A bigger downside is that this unit’s particle filter needs to be replaced an average of every six months. Also, the Blueair Classic 605 doesn’t ship with an activated carbon filter, so if you need odor control or filtration of VOCs, you will have to upgrade to their SmokeStop filter. These are fairly expensive to switch to, but it is recommended you do so in order to get truly pure air.

    This shortcoming aside, the Classic 605 is still one of the most powerful smart air purifiers on the market. If maximum filtration is what you’re after, then this is the pick.

    Dimensions: 26 x 20 x 13 inches
    Weight: 31 pounds
    Smoke CADR: 500 cfm
    Max room size: 775 square feet
    Noise: 32-66 dB(A)
    Average filter replacement: 6 months
    Warranty: 5-year limited

  3. 3. Winix HR9500 Wifi Enabled Air Cleaner

    • 5-stage filtration system for cleanest air
    • Versatile app tracks air quality history
    • Nearly silent on low
    • Light sensor cannot be disabled in auto mode
    • App is tricky to set up
    • New filters smell bad at first

    The Winix HR9500 is one of the best smart air purifiers for pet owners. It employs an unparalleled five-stage system to clean your air in more ways than you thought possible. Its HEPA filter includes an added anti-microbial coating, which prevents the growth of microorganisms on the filter. It has an activated carbon filter, which despite being a little flimsier than others, compensates with a deodorizing coat for better odor absorption. The HR1000 also has a washable permanent pre-filter, which if washed every two weeks, will help improve the longevity of the other filters.

    Its final layer of protection is Winix’s proprietary PlasmaWave technology, which breaks apart pollutants by generating positive and negative ions. It makes an occasional humming noise and can dry the air slightly, but it can be turned off if you deem it unnecessary. Considering no other smart air purifiers on the market employ this level of filtration, you might perceive it as overkill, but if you have lots of animal hair and dander floating in the air, the extra assurance sure doesn’t hurt.

    Despite all the extra features, the HEPA filter only needs to be replaced on a standard 12-month cycle, and the carbon filter on a standard 6-month cycle. You can get a pair of replacement Winix HEPA and carbon filters for a decent price when bundled, so some users stretch their carbon filter a 12-month cycle for a more cost-efficient replacement.

    The HR9500 has four different fan settings: low, medium, high, and turbo. It is fairly middle of the road in terms of noise level. For an even better balance of sound and performance, this air purifier has an auto mode that automatically adjusts the fan speed to keep your air at the best quality level. The only downside to auto mode is that the unit automatically turns off when its light sensor detects darkness so it will not run at all at night. Those who want to keep the unit on at night will have to set a custom schedule. For some, this makes the auto mode practically useless.

    Setting a custom schedule can only be done through the Winix Smart app. Once you get past the tricky Wi-Fi setup, the app gives you access to scheduling, remote controls, and a helpful air quality history log. Everything else can be taken care of through the HR9500’s LED illuminated panel. The LEDs automatically dim at night, and the control panel has a filter replacement indicator for both replaceable filters.

    One last note is mostly to quell the worries of recent purchasers who report a strange “plasticy” smell from new units. This is normal from most air filters and will go away in just a day or two. If you let it run exclusively while you’re out of the house for the first few days, you won’t even have to worry about it, and then you’ll be back to just clean air.

    Dimensions: 23.6 x 16.3 x 9.6 inches
    Weight: 18.7 pounds
    Smoke CADR: 258 cfm
    Max room size: 300 square feet
    Noise: max 55.2 dB(A)
    Average filter replacement: 12 months
    Warranty: 2-year limited

  4. 4. Honeywell HPA250B Smart Allergen Remover

    • Compact and energy efficient
    • Dual HEPA filters + activated carbon filter
    • Allergen sensor mode makes you aware of specific contaminants
    • Slightly louder than other models
    • App doesn’t work correctly on some devices
    • Less air turnover

    The Honeywell HPA250B is a compact clean air solution that brands itself as an allergen remover. It offers some unique features for those who suffer from allergies to pollen, mold, animal dander, smoke, dust, etc. Rather than bog you down with a half-dozen cleaning modes, it offers a simple suite of purifying programs that will target specific air pollutants in your home.

    From the control panel at the top of the unit, you can cycle between a general clean mode, a germ mode, an allergen mode, and a turbo mode. Also present on the touch panel are filters status notification lights, and my personal favorite addition, a button the dims/disables all the LEDs on the control panel. An additional VOC sensor button can be used in combination with any of these modes to dynamically adjust the power based on the air quality in the room.

    You also have a light to show when the filters need to be replaced, a basic timer that goes up to eight hours, and a button to sync Bluetooth connection. You can use Bluetooth or WiFi to connect to your phone via the free Honeywell app. This unlocks additional features like the high allergen level alerts feature, a rudimentary schedule system, basic remote control functions, and more. The app doesn’t work as consistently on Android devices, but thankfully, this air purifier still feels pretty smart even if you don’t get it hooked up to your phone.

    Going back to the different modes of the HPA250B, you have enough fan speeds and specialized modes to suit any need. The fan runs decently quiet at its lowest setting but is far from the most silent unit out there. Of course, how it performs is much more important than how it sounds. The HPA250B efficiently cycles air in rooms up to 310 square feet. In turbo mode, its CADR maxes out at 200 cfm, but as the VOC sensor mode demonstrates, it is rarely necessary to leave your purifier on turbo for more than a few minutes.

    This smart air purifier uses two HEPA filters and an activated carbon pre-filter. Having two filters is always a nice failsafe in case one is compromised. Because of its small size, the HEPA filter replacement is very inexpensive. They are good for a standard 12 months. Just keep in mind that the HPA250B’s carbon pre-filter is not permanent or washable, so plan to buy a replacement carbon filter every three months. 

    Dimensions: 18.9 x 10 x 17.7 inches
    Weight: 13.9 pounds
    Smoke CADR: 200 cfm
    Max room size: 310 square feet
    Noise: 43-63 dB(A)
    Average filter replacement: 12 months
    Warranty: 5-year limited

  5. 5. Dyson Pure Cool Purifying Tower Fan TP04

    • Doubles as a bladeless tower fan
    • Built-in air quality monitor
    • Stylish with a small footprint
    • High speed fan makes for low CADR
    • High price tag
    • Smaller overall filter

    The Dyson Pure Cool Purifying Tower Fan is a unique gadget that acts as both an air purifier and a tower fan. It can clean and cool your air simultaneously, but with a trade-off. Because this bladeless fan moves air so quickly, you can expect a low overall CADR. Dyson doesn’t bother to measure the CADR of this product, likely because it uses a lower filter surface area to achieve higher air displacement.

    For the sake of comparison, another source calculated it at about 44 cfm, which supports the notion that it circulates more air than it cleans. If you are looking for a high volume air purifier, you can stop reading right here. Don’t get me wrong, the Pure Cool will certainly improve your air quality, but it’s not exactly the unit you’d choose to treat severe allergies.

    As a fan, it works fantastic (pun intended). It offers 350° oscillation, plus forward and reverse airflow modes. Plus it is bladeless, which looks and feels so cool. Still, the internal HEPA filter reduces its overall air output, meaning it is ultimately outclassed by other fans. But do other fans have an air quality sensor? I think not. This one does, and it’s an incredibly accurate one at that. This air quality sensor is used to help the fan determine how much power to put towards filtering the air. It will automatically balance power consumption with filtration to keep incoming air at the best quality.

    In addition to auto mode, this fan also sports a quieter night mode, plus your standard manual speed settings. Turning up the fan increases the rate of purification as well. The TO04’s combination HEPA and activated carbon filters are easy to replace, which you should do every twelve months on average. Additionally, the wide variety of filters on the Dyson site makes the correct one hard to find. The one that fits the TP04 is somewhat expensive, so bear that in mind. The Cool Link app provides useful features like the ability to track historical air quality levels as well as humidity and temperature levels.

    It has a seven-day scheduling system and allows you to change all of its settings from anywhere in the house, basically acting as a remote control. While the Pure Cool is neither the best air purifier nor the best fan, it achieves something special by combining both into a unique package. And if that works for even one person out there, then I’ve done my job correctly.

    Dimensions: 41.5 x 8.8 x 8.8 inches
    Weight: 10.8 pounds
    Smoke CADR: 44 cfm (calculated)
    Max room size: 290 square feet
    Noise: max 63 dB(A)
    Average filter replacement: 12 months
    Warranty: 2-year limited

  6. 6. GermGuardian CDAP5500BCA Smart Air Purifier

    • Built-in UV light for added purification
    • Versatile app provides indoor and outdoor air monitoring
    • Compact and energy efficient
    • Short filter lifecycle
    • Small filter size means lower overall CADR
    • LEDs cannot be disabled

    The GermGuardian CDAP5500BCA is the smallest air purifier on our list, but don’t count it out just yet. This air purifier has a surprisingly high CADR despite its size. It can clean 125 cfm of air, which is good enough to purify a room roughly 167 square feet in size. In addition to a HEPA filter and an activated carbon filter, the GermGuardian uses a UV-C bulb to kill airborne bacteria before it even touches a filter.

    It knows exactly how aggressively to use these features thanks to a sophisticated air quality monitor, which displays a status of your general air quality on a digital display at the top. Also at the top of this unit is a button to toggle the UV light, one to set a time, one to toggle fan speed, a Bluetooth link button, and an on/off button. It has speed modes ranging from one to five in power, but there is a useful auto mode to optimize your air quality with the least energy consumption.

    You can cycle through these modes with the GermGuardian app, as well as set a timer or toggle the UV mode. Sadly, extra features like scheduling are missing, but with a unit this small, it is more intended for a single room rather than a large portion of your home. And how complicated does it have to be to keep one room clean? Plus the app isn’t too over-complicated, so it is actually fairly easy to set up for once. You can do so via Bluetooth or Wifi.

    A fairly new feature is support for Alexa and Google Assistant. If you have a phone or speaker set up with one of these services, you can program basic voice commands to turn your air purifier on or off, or change its fan speed. The GermGuardian’s HEPA filter and activated carbon filter are joined together into a single FLT5000 filter, which is fairly inexpensive to replace. The one downside is that they share a fairly low 6-8 month lifecycle.

    Ultimately, this ends up not being a huge issue, as the unit itself is the fraction of the price of our top-rated models. If you want a smart air purifier without bells and whistles that barely work anyway, then the GermGuardian is a great pick for you.

    Dimensions: 27.6 x 6.7 x 9 inches
    Weight: 11.6 pounds
    Smoke CADR: 108 cfm
    Max room size: 167 square feet
    Noise: Not listed
    Average filter replacement: 6-8 months
    Warranty: 5-year limited

  7. 7. Elechome A3B Smart Air Purifier

    • Nearly silent on low
    • Built-in air quality monitor
    • Versatile app tracks air quality history
    • App is tricky to set up
    • New filters smell bad at first
    • Low filter lifespan

    The Elechomes A3B Pro Air Purifier is a compact yet powerful unit that is ideal for keeping a bedroom or home office free from airborne particulate matter, gas pollutants, and microorganisms. It may have a smaller max room size than other air purifiers on this list but its clean air delivery rate is still impressive at 135 cfm. That is enough to efficiently clean the air in rooms up to 323 square feet in size.

    The A3B is compact in weight and size, making it easy to add to even the most cluttered rooms. It has a touch LCD screen with an air quality score display and buttons to set a timer, adjust the fan speed, engage the child lock, and to pair via Wi-Fi. These, of course, can mostly all be controlled through the app as well.

    The Smart Life app integrates the Elechome air purifier into your smart home, allowing you to remotely schedule periods of increased air cleaning as well as monitor your room’s air quality in realtime. Unfortunately, this app is not without its pitfalls. The main flaw is that it is tricky to pair. It took me several tries to pair my sample unit. The app also requires you to make a user account which is an extra step. The air quality history and live air quality notifications are the main payoff for the setup but just keep in mind that you have to have the phone app running in the background if you want to get notifications.

    When it comes to cleaning the air, that is where the A3B truly shines. It can handle a fairly high volume of air, especially on the highest power setting. Power level 3 is loud enough to drown out a two-person conversation but the lowest power level is nearly whisper quiet. The onboard air quality score makes it easy to track the filter’s effectiveness as it pulls smoke, pollen, and microorganisms from the air.

    This air purifier has a washable pre-filter plus a composite carbon cloth filter. The composite filter uses a combination of antibacterial cloth, activated carbon, and a HEPA filter, which most importantly filters out any particles larger than 20 nanometers. Because this filter is smaller than others we reviewed, it needs to be replaced once every two months of use. You can get a longer lifespan out of it if you regularly clean the prefilter, though. The standard recommended cycle for cleaning the pre-filter is twice a month. If you are only concerned about air quality in a small-to-medium-sized room, then the Elechomes A3B is a great way to get a high CADR rate for cheaper.

    Dimensions: 12.8 x 6.8 x 820 inches
    Weight: 11 pounds
    Smoke CADR: 135 cfm
    Max room size: 323 square feet
    Noise: max 30-55 dB(A)
    Average filter replacement: 2 months
    Warranty: 1-year limited

More Info

Despite the importance of air quality to health, developments in improving world air quality are all fairly new. Since commercial emissions have only been regulated since the '90s, modern families have to take their lung health into their own hands with home air purifiers.

Since harmful air pollutants exist beyond the scope of any legislative protection, a smart air purifier is one of the only ways you can monitor and control your home air quality.

Plus, even if the emission of VOCs (volatile organic compounds) like propane, benzene, methane, etc. may be regulated, but the air we breathe is still rife with other dangers like mold, mildew, viruses, and allergens.

An air purifier is the only sure-fire way to eliminate these contaminants, as it is the only solution for which there is a vast amount of scientific research that backs it up.

An article originally published in the official publication of the Indian Chest Society cites several studies that confirm the positive impact that air filters have on your respiratory and vascular health.

Air purifiers are made with HEPA (high-efficiency particulate air) filters, which are Standardized at a minimum 99.97% efficiency rating for removing particles greater than or equal to 0.3μm in diameter. That encompasses nearly every harmful nanoparticle that would find in your living space.

The only pollutants that get past HEPA filters are VOCs like formaldehyde, ozone, carbon monoxide, and carbon dioxide. The best air purifiers also include an activated carbon filter to remove these gaseous pollutants before the air reaches the HEPA filter.

Air purifiers are recommended for those that live in polluted metropolitan areas and for those that deal with severe allergies. They are also helpful in climates that promote indoor mold growth, or for those trying to reduce odors like cigarette smoke in their homes. They will basically clear the air of anything that may jeopardize your health.

So what added benefits are gained from going with a smart air purifier?

The latest generation of smart air purifiers allows you to better understand what’s in the air you breathe, providing you with up to date alerts on the level of various pollutants in your home and neighborhood.

They can also be programmed to react accordingly, even when you’re away from home. Being able to use your smartphone as a remote basically means being able to change your fan schedule even while you’re away from home.

If you use other integrated home devices, then most smart air purifiers can be integrated into systems like Alexa or IFTTT.

But before you purchase any kind of air purifier, you must be mindful of the CADR (clean air delivery rate) rating needed for the type of pollutant you’re targetting and the size of the space you plan to keep clean. This figure was developed by the AHAM (Association of Home Appliance Manufacturers) and is measured in cfm (cubic feet per minute). Its importance is outlined in the EPA’s guide to home air cleaners.

To give you an idea of the overall power of these air purifiers, we’ve determined the most effective units by measuring their smoke CADR, which represents their effectiveness at removing the smallest pollutant particle size.

The higher the smoke CADR, the more effective the filter is at removing all pollutants, small or large. The CADR you need is based on the size of the room it will be used in.

Determine the square footage of the room(s) you wish to keep purified and compare it against the max room size supported by the air purifier. If you use an air purifier in a room larger than it is rated for, then the air won’t be changed enough to make a significant impact on your home air quality.

Also note that any models we recommend come in versions suited for smaller rooms, but in the interest of providing you the most powerful selection of air purifiers, we’ve highlighted the models with the largest individual room size rating.

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