Coway Mighty 4-Stage Eco-Friendly Air Purifier

Last updated: February 14, 2023


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.

Coway Mighty 4-Stage Eco-Friendly Air Purifier

We looked at the top Air Purifiers and dug through the reviews from some of the most popular review sites. Through this analysis, we've determined the best Air Purifier you should buy.

Product Details

Key Takeaway: Perfect for small- and medium-sized spaces, this Coway Mighty Air Purifier is especially useful if you suffer from allergies.

In our analysis of 65 expert reviews, the Coway Mighty 4-Stage Eco-Friendly Air Purifier placed 6th when we looked at the top 17 products in the category. For the full ranking, see below.

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.

Expert Reviews


What reviewers liked

This is one of the smallest air purifiers, making it easy to move from room to room as you need.
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.
Bolstered by high end air cleaning and a quiet fan, the Coway AP-1512HH was the best overall performer in our testing
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.
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.
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.
Using a four-stage filtration system, this Coway purifier removes 99.9% of contaminants from the air
Highly effective. This air cleaning system is designed to deliver an impressive performance. Users have expressed satisfaction with its effectiveness.
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.
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.

What reviewers didn't like

lacks useful help and support, as we had difficulty contacting a representative to answer some of our most basic questions.
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.
Expensive up front cost.
Unfortunately, the Coway isn't effective at removing odors.
Can be loud, Sensitive on default settings
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 top light can’t be turned off
Unfortunately, this unit doesn’t have a sleep mode. You’ll have to adjust the fan speed manually.
View our Air Purifier buying guide for in-depth advice and recommendations.

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