Coway Mighty Air Purifier

Last updated date: July 26, 2019

DWYM Score
9.3

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We looked at the top 1 Air Purifiers and dug through the reviews from 10 of the most popular review sites including Top Ten Reviews, New York Times Wirecutter, Tech Gear Lab, Healthy But Smart, Digital Trends, Engadget, The Spruce, The Air Geeks, Breathe Quality, Fresh Air Guide and more. Through this analysis, we've determined the best Air Purifier you should buy.

Overall Take

The relatively low price point on the Coway doesn't mean it's short on features. This compact unit supplements its HEPA filter with a bipolar ionizer and two additional filters, making it especially attractive to the allergy-prone. This is the purifier to get when you have a medium-to-small size area that you need reliably clean. In our analysis of 54 expert reviews, the Coway Coway Mighty Air Purifier placed 2nd when we looked at the top 10 products in the category. For the full ranking, see below.

Editor's Note August 12, 2019:
Checkout The Best Air Purifier for a detailed review of all the top air purifiers.

Expert Summarized Score
9.2
10 expert reviews
User Summarized Score
8.8
1,251 user reviews
Our Favorite Video Reviews
What experts liked
This is one of the smallest air purifiers, making it easy to move from room to room as you need.
- Top Ten Reviews
The Coway is HEPA-certified and rated to clean areas up to 350 square feet—the size of a large living room. In a space of that size (with standard 8-foot ceilings), it can deliver 5.7 air changes per hour (ACH) on its high setting, well above our minimum requirement of 4.
- New York Times Wirecutter
November 29, 2018 | Full review
Bolstered by high end air cleaning and a quiet fan, the Coway AP-1512HH was the best overall performer in our testing
- Tech Gear Lab
The Coway AP-1512HH is a great air purifier for just about anyone. Its great features, like auto mode, ionizer, and large coverage, are enough to put this purifier on most people’s top ten list.
- Healthy But Smart
July 20, 2018 | Full review
The air purifier boasts impressive clean-air delivery ratings of 233 for smoke, 246 for dust, and 240 for pollen. This means that the AP-1512HH can completely clean the air of these contaminants four times per hour, the optimal frequency for users with allergies, in a space of 350 to 360 square feet.
- Digital Trends
May 30, 2018 | Full review
The $250 Coway AP-1512HH Mighty earned our pick for overachieving in every regard. Despite being the smallest machine we tested, our results show that it was just as effective at purifying air as much large purifiers that sell for many times its price.
- Engadget
May 22, 2015 | Full review
Using a four-stage filtration system, this Coway purifier removes 99.9% of contaminants from the air
- The Spruce
January 15, 2019 | Full review
Highly effective. This air cleaning system is designed to deliver an impressive performance. Users have expressed satisfaction with its effectiveness.
- The Air Geeks
Close to perfection. That’s the best way to describe the filtration power of Coway AP-1512HH.A washable pre-filter will help you capture the large particles of contaminants, from pet hair, human hair and mold. Keep in mind that this pre-filter is washable and therefore, is permanent to use.
- Breathe Quality
November 15, 2018 | Full review
This air purifier makes four air changes per hour. This means all the air in the room runs through the filters once every 15 minutes.
- Fresh Air Guide
July 1, 2017 | Full review
What experts didn't like
lacks useful help and support, as we had difficulty contacting a representative to answer some of our most basic questions.
- Top Ten Reviews
The chief complaint, and one we’re not alone in making, is that the Coway’s “air quality indicator” light, on top of the unit, is ridiculously bright, cannot be shut off, and interferes with sleep.
- New York Times Wirecutter
November 29, 2018 | Full review
Expensive up front cost.
- Tech Gear Lab
Unfortunately, the Coway isn't effective at removing odors.
- Engadget
May 22, 2015 | Full review
Can be loud, Sensitive on default settings
- The Spruce
January 15, 2019 | Full review
Sensor issues. A small fraction of users has complained that their air quality sensor does not appear to function well. Such users can therefore not rely on the air quality display.
- The Air Geeks
The top light can’t be turned off
- Breathe Quality
November 15, 2018 | Full review
Unfortunately, this unit doesn’t have a sleep mode. You’ll have to adjust the fan speed manually.
- Fresh Air Guide
July 1, 2017 | Full review

From The Manufacturer

The mighty air purifier is compact by design, but is equipped with Cutting edge features to keep your indoor air clean. Equipped with a HEPA efficiency RATING of 99.97percent , it uses a four-stage filtration system to effectively eliminate odors and pollutants. This mighty machine includes an air quality indicator through our particle sensing technology that will kick your air purifier into high gear when needed. And when 30 minutes when pollution is not detected for 30 minutes, the fan will automatically stop to save energy.

Overall Product Rankings

1. Alen BreatheSmart Air Purifier
Overall Score: 9.5
Expert Reviews: 4
2. Coway Mighty Air Purifier
Overall Score: 9.3
Expert Reviews: 10
3. IQAir HealthPro Plus Air Purifier
Overall Score: 9.0
Expert Reviews: 3
4. AirMega 400 Air Purifier
Overall Score: 8.9
Expert Reviews: 3
5. Blue Pure 411 Air Purifier
Overall Score: 8.6
Expert Reviews: 4
6. Blue Pure 211+ Air Purifier
Overall Score: 8.6
Expert Reviews: 5
7. GermGuardian Full Room Air Purifier
Overall Score: 8.5
Expert Reviews: 5
8. Whirlpool Whispure Air Purifier
Overall Score: 8.1
Expert Reviews: 4
9. Honeywell True HEPA Allergen Remover
Overall Score: 7.6
Expert Reviews: 4
10. Austin Air Healthmate Standard Air Purifier
Overall Score: 6.6
Expert Reviews: 2

An Overview On Air Purifiers

The reasons for buying an air purifier can be as numerous as the number of pollutants in the air — and indoors, that number tends to be bigger than most people would expect. Despite the best efforts of the filters in our air conditioners, pollen and dust particles can settle into carpets and upholstery. Mold spores can grow in moist areas. And if there are pets or smoke involved, expect dander and carcinogens to be part of every breath.

Whether you suffer from allergies or just want to eliminate the smell associated with all this particulate matter, a good air purifier can be an essential accessory in any room. But how are they different from the filters we already have in our regular AC?

All that depends on the purifier. Most models circulate air through a HEPA (High-Efficiency Particulate Air) filter, and often more than one. HEPA filters are certified to trap particulate matter as small as 0.3 microns, which covers dust, pollen and most bacteria. Some purifiers boast a medical-grade Hyper-HEPA filter that will go down to 0.003 microns — enough to pick smoke out of the air.

In conjunction with this, the more high-tech air purifiers can employ an extra line of defense. The Germ Guardian uses an optional UV light that renders many micro-organisms sterile, and an activated charcoal filter that can actually pull in and neutralize toxins through electrostatic attraction. There are also models like the Coway Mighty Air Purifier that can ionize incoming particles, which are then sucked in by metal plates or other treated substances.

A word of caution on ozone, though. While they’re less common these days, some air purifiers generate ozone, which, according to the manufacturers, can deodorize and disinfect the air. The jury is still out on those claims, and in fact the presence of ozone in confined spaces can be more harmful than the pollutants you’re trying to get rid of.

For a measure of general effectiveness, you can look for a rating on most air purifiers called the CADR — Clean Air Delivery Rate. It’s a number that represents the cubic feet per minute (CFM) of air that has been cleared of all the particles of a given size. These ratings are recognized by the EPA and can be found on most devices. If you can’t find them, the number is fairly easy to calculate: Just take the CFM on the air purifier and multiply it by the percentage of a certain particle (smoke, pollen, etc.) that the machine can remove.

DYWM Fun Fact

That air purifier humming away in the corner of your room may look tranquil, but it was initially created for military use. The HEPA filters that are so common today were first employed to keep lab workers safe at the Manhattan Project, the 1940’s scientific effort that led to the creation of the atomic bomb. Back then, scientists were less concerned with their ability to keep their allergies in check. They were using the filters to block out as much radioactive material as possible.

The Air Purifier Buying Guide

  • One of the first things you’ll want to consider when buying an air purifier is the kind of room you’ll be using it in. When it comes to price, this is usually the primary factor. A workhorse unit that can handle an entire living room and kitchen is going to run you significantly more than a machine that’s meant for a home office (the Coway Mighty) — for good reason.
  • Are you looking for protection from allergies or just need to freshen up the air? A quick look at the specs for the purifier should tell you what particles it can effectively remove from the air. Again, a HEPA filter is going to do the trick for most common irritants and odors, including pet hair and dust. But if you live in a smoker’s house, look into something more robust.
  • Much like your air conditioner, you’ll likely be keeping an air purifier on for as long as you plan on breathing the air in that room. In a lot of cases, that might be all day, so power consumption matters. Frugal users might want to check out the wattage specs on prospective models. There are also features that can mitigate that electricity drain, such as timers. In most cases, your air purifier won’t be running all the time. It’ll cycle the air through a few times an hour, and you can adjust that number more or less with most models. The Alen BreatheSmart does one better, with a handy sensor that measures the air quality in the room and automatically adjusts the fan speed and cycle time to match its needs.
  • Another thing to figure into your price point are the filters. Like your AC, there’s upkeep involved. Check not only the price of your filter, but the frequency with which you’ll need to replace it.
  • Since they’re meant for indoor use, most air purifiers are better looking than, say, that wall AC unit you had in your dorm room at college. That said, few people want them as the focal point in a room. If you’re getting one for a small room, you likely want a small purifier — or at least one that’s nondescript. Sleekly designed at less than 17″ x 19″, the Coway Mighty fits the bill on both counts.