Coway Airmega Mighty AP-1512HH Review: Why This Air Purifier Remains Popular A Decade Later

For more than a year, I've been paying extremely close attention to the air quality in my home. My newfound obsession came on like a one-two punch. First, a family member was diagnosed with a serious lung condition that made the steady hum of an oxygen concentrator the new soundtrack of our daily life. Then, shortly after, I noticed a dark spot creeping across the ceiling in our sunroom — the result of a horrible leak in the roof. Although the roof had been completely replaced, that sudden stain left me with a question I couldn't scrub away. Is there something seriously wrong with the air in our house?

It will come as no surprise that I was thrilled when Hunker was provided with the Coway Airmega Mighty AP-1512HH to review. The air purifier was already on my radar, since it's been the New York Times' All-Time Favorite Wirecutter Pick for the past 11 years, and for good reason. Over the years, the $239.99 unit garnered hundreds of five-star ratings from users who rave about its sleek look, quiet performance, and automatic controls. With its four-stage infiltration purifier, it uses a pre-filter, a deodorization filter, a HEPA filter, and a bipolar device to keep the air clear of contaminates. And since keeping track of air quality has become so important to me, I was also happy to see that it has an air quality indicator that changes the fan's speed based on the amount of particles in the air. So, does the Airmega Mighty deserve all this hype? I put it to the test to find out.

When the Coway Airmega Mighty landed on my doorstep, I was caught off guard by the size of its box. Fortunately, it's just really well packaged and the unit itself was surprisingly slim. Unlike some of the other air filters I've studied while doomscrolling late at night, this one isn't a towering fan. Instead, it's a narrow 16.8-inch by 18.3-inch square that can fit discretely on a table or desk, which is exactly where I began my first test.

Although the ceiling stain is long gone, I'm still suspicious of the air quality in our sunroom. Our wonderful roofers assured me that the water penetration problem was the result of a missing drip edge that has now been installed, that the underlayment is brand new, and the rafters underneath were bone dry. I believe them. But I still set up the Airmega Mighty directly underneath the spot where that dark stain first appeared, since that seemed like a good excuse to see exactly what this air purifier could do.

Coway claims the unit is capable of 4.8 air changes per hour in a 361 square foot space, just a little larger than the sunroom. I decided to leave it running for a full 24 hours to monitor the air quality and see if I could tell any difference after it was purified. And because the Airmega Mighty has earned praise for its odor-absorbing qualities, and our sunroom is located right off the kitchen, I really went for it by making some crispy bacon and burning a few pancakes accidentally-on-purpose. When it quickly became clear why the air purifier has such a big fan club, I moved it to a tight corner in our 850-square-foot bedroom, which includes a bathroom, to see how it could handle the large space.

The unboxing and setup process took less than five minutes, most of which involved freeing each of the three filters from their sealed plastic packaging. I was admittedly curious to see how well they worked, but the real-time air quality monitoring was the feature I was most excited to test.

The Airmega Mighty has five clearly labeled buttons on top, with a small indicator light beside them that shifts from blue to purple to red as air quality moves from good to moderate to poor. I breathed an enormous sigh of relief when the unit immediately displayed a glowing blue light as soon as it was powered on. I took it as a reassuring sign that perhaps the air quality in our sunroom was okay after all. It became slightly purple just briefly as I burned my way through breakfast, but returned to blue by the time I was done washing the dishes.

I left the Airmega Mighty on its default auto setting throughout the sunroom test, which is exactly the kind of hands-off operation my busy family life demands. Coway says the intuitive air quality indicator reacts instantly to particles in the air and automatically adjusts its fan speed accordingly. I remain a little skeptical, because although I could manually crank it up with the touch of a button, I never saw the fan automatically adjust beyond its lowest setting even while I was cooking in a smoke-filled kitchen just a few feet away.

It's entirely possible the Airmega Mighty's filtration and airflow are just that good even on the lowest setting, because my house has never smelled better. Since nose-blindness is really a thing, I went for a long walk after cooking breakfast. When I returned, instead of being smacked in the face with a reminder of my last meal, I didn't smell anything at all.

HEPA filters are practically mandatory when you're dealing with dust, mold, pollen, and odor-causing bacteria, so it's no surprise the Airmega Mighty has one. What did surprise me was its thickness. This thing is like a book! It's the first of three filters you'll install before powering up the unit. The other two fit together before being held in place with two plastic tabs. One is a pre-filter, a plastic grid covered in a silvery mesh designed to catch hair, fur, and other large particles. The other is a flat deodorizing filter that reminded me of the scratchy side of a cheap kitchen sponge. Its job is to trap volatile organic compounds (VOCs), pet and food odors, and cigarette fumes.

I can't overstate how well the Airmega Mighty's deodorizing filter worked at getting rid of unpleasant odors. After experiencing a major roof leak, the girthy HEPA filter also gave me some peace of mind about whatever airborne particles were still floating around the sunroom. And I can imagine how much the pre-filter helps pet owners engaged in an endless battle with fur and dander. Coway calls the Airmega Mighty a "four-stage filtration air purifier," so you might be wondering why there are only three filters. It wasn't until I read the manual that I understood the fourth stage — a bipolar ionizer is tucked inside the machine.

I did a little more reading about the difference between air purifiers and ionizers before moving the Airmega Mighty into our primary bedroom. Although ionizers are extremely effective at removing small particles from the air, they can also emit lung-irritating ozone, according to the U.S. Environmental Protection Agency. Fortunately, Coway designed the ionizing mode to remain off by default. Pressing the ionizer button activates this feature, which I tested only briefly to avoid any potential negative health outcomes for my compromised family member. It made no difference in terms of noise, but did create a slight chlorine-like smell.

Because our bedroom is three times the size of the sunroom, I turned the Airmega Mighty to the highest setting instead of leaving it on auto mode after relocating it. According to Coway, the unit purifies 1,748 square feet in 60 minutes. To test this, I set the built-in timer to one hour and closed the door. Once again, the room smelled astonishingly fresh when I returned.

The Wirecutter team has experimented with leaving the unit running non-stop for years without incident. And I'm used to quite a bit of white noise from the oxygen concentrator and CPAP machine in our bedroom. That said, leaving the Airmega Mighty running continuously on the highest setting was too loud to get any rest. Instead, we turned it to eco mode. This quieter setting intermittently cycles every 30 minutes. Coway says it can reduce energy consumption up to 75%, and knowing we won't be hit with a massive utility bill at the end of the month helps me sleep a little easier.

Coway allowed Hunker to test and review this product with no strings attached, probably because the company was so confident we'd love it as much as everyone else. They were right. I highly recommend the Airmega Mighty AP-1512HH to anyone who needs or wants to improve the air quality in their home on a budget.

Between astronomical medical bills, unexpected home repairs, and the rising cost of just about everything, I'm not interested in spending money on a household gadget unless it makes a pretty convincing case for why I need it. While the Airmega Mighty isn't the cheapest option out there, the peace of mind it creates regarding one's indoor air quality is worth the cost. I appreciate that it comes with a money back guarantee, year-long manufacturer's warranty, and filter replacement subscription options available at a deep discount.

Although it's recently been edged out of Wirecutter's top spot by the newer AirMega Mighty2, I found the original to be an affordable option that can handle whatever stinky, dusty, funky stuff is floating around your home. Although it isn't the tiniest air purifier on the market, the Airmega Mighty is small enough to fit into RVs, studio apartments, and other tight spaces. But that doesn't mean you should overlook it if you have a larger space, especially if you would rather have an air purifier that's relatively discrete instead of a towering colossus.