Air Purifiers · Head-to-head
Medify MA-40 vs Coway AP-1512HH Mighty: is the extra $120 buying cleaner air?
Two air purifiers aimed at the same living room, priced $120 apart. The Medify MA-40 lists at $290 and leads with an H14-grade True HEPA filter plus a UV stage. The Coway AP-1512HH Mighty lists at $170 and leads with a particle sensor, an auto mode and a 24 dB low setting. Scoring the published specs, the engine puts the Coway at 7 against the Medify's 5, which makes this one of the rare matchups where the cheaper machine is also the better one. That does not make the Medify pointless. It carries the higher coverage rating and the higher stated filter grade, and there is a specific buyer for whom those two lines outweigh the score gap.
| Medify MA-40 | Coway AP-1512HH Mighty | |
|---|---|---|
| Overall score | 5/10 | 7/10 |
| Clean air | 5/10 | 6/10 |
| Quiet | 5/10 | 8/10 |
| Smart | 5/10 | 7/10 |
| Smoke CADR | 224 CFM | 233 CFM |
| AHAM room size | 420 sq ft | 361 sq ft |
| Noise floor | 31 dB | 24 dB |
| Power draw | 60 W | 77 W |
| Features | UV + timer + child lock | sensor + auto + eco, no app |
| Street price | $290 | $170 |
| Typical price | $290 | $170 |
Clean air: nine CADR points apart, and a coverage number that misleads
On delivered clean air these two are close to a tie. The Coway posts AHAM CADR of 246 dust, 233 smoke and 240 pollen. The Medify posts 224 on the smoke figure. Nine points of smoke CADR is roughly a 4 percent difference, which is not something anyone notices in a room. The engine still scores clean air 6 for the Coway and 5 for the Medify, because the Coway moves slightly more air. Where the spec sheets stop agreeing is coverage. The Medify is rated for 420 sq ft and the Coway for 361 sq ft, and that is backwards from the CADR numbers. Two units within nine CADR points of each other cannot honestly cover rooms 59 sq ft apart under the same air-change assumption. The brands are using different conventions, so treat the coverage line as marketing arithmetic and the CADR line as the specification. That matters most for the number Medify puts in front of buyers: 1,793 sq ft. That is the one-air-change-per-hour figure, and one air change an hour is a low bar - the amount of filtration you would accept in a hallway, not what you want in a bedroom during pollen season. The AHAM-class figure for the same machine is 420 sq ft. Size the room around that one.
Noise: the 7 dB gap decides more than the CADR gap
The Coway runs at 24 dB on its lowest setting. The Medify runs at 31 dB. The engine scores quiet 8 against 5, and that is the widest separation between these two on any dimension. Seven decibels is a lot. The scale is logarithmic, and roughly every 10 dB reads as a halving of perceived loudness, so the Medify at its quietest is close to twice as loud as the Coway at its quietest. In practice, 24 dB tends to disappear under the background noise of an occupied house. 31 dB is audible in a quiet bedroom at 2 a.m., and audible is where people start reaching for the power button. That is why this matters more than the nine CADR points: a purifier switched off at night delivers zero clean air for eight hours, which no throughput advantage can offset. The Coway compounds the lead with an air-quality sensor driving auto and eco modes, plus an LED that reports what the sensor is reading, so the fan can back off on its own when the room is clean. The Medify has no sensor and no auto mode. It holds whatever speed you last selected until you change it by hand. If this unit is going in a bedroom or a home office, this section is the entire comparison.
What the extra $120 actually buys - and what it does not
Neither machine has an app. That is worth stating plainly, because a $120 price gap invites the assumption that the expensive one is the connected one. It is not. No phone control, no remote scheduling, no history graphs on either. If app control is the feature driving the purchase, both of these are the wrong shortlist. What the $170 Coway includes is the automation layer: particle sensor, auto mode, eco mode, air-quality LED. The engine scores it 7 on smart features. What the $290 Medify includes instead is a UV stage, a timer and a child lock, and it scores 5. The UV stage does not raise the CADR number - 224 already describes what the unit delivers - so it is a filtration claim rather than a throughput one. The child lock is a real advantage in a house with toddlers, and nothing on the Coway side substitutes for it. Power draw runs against expectation too. The Medify pulls 60 W at maximum against the Coway's 77 W, so on paper the Medify is cheaper to run. In practice the Coway has auto mode and the Medify does not, which means the Coway spends most of its life below its ceiling while the Medify sits at whatever speed you set. Nameplate wattage is not the running cost.
When the Medify MA-40 is still the right buy
Three cases. First, a room larger than the Coway's 361 sq ft rating, where the Medify's 420 sq ft is the higher published number. Read that one carefully, though - the CADR figures say the real gap is small, and at list prices two Coways cost $340 against $290 for one Medify. Two units in a large open-plan space put clean air at both ends of the room, which one unit cannot do at any CADR. Second, the filter grade, if that is the deciding factor. Medify states H14-grade True HEPA on its listing, and that spec is the reason the unit exists. For a household managing diagnosed allergies or asthma where that grade has been specified, buy the Medify and accept the noise. Just understand that filter grade only applies to the air that passes through the filter, and airflow determines how much air does. Third, the child lock, if small hands can reach the controls. Outside those three cases the math does not work. Do not buy the Medify on the strength of the 1,793 sq ft number. Do not buy either one expecting app control. And watch street prices: the Medify bottoms out near $250 and the Coway tops out near $230, so on a bad day the gap shrinks to $20. The spec gap does not shrink with it, but the Medify's coverage rating and child lock get easier to justify at that spread.
Verdict
The Coway AP-1512HH Mighty wins at 7 to 5, and it does it at $170 against $290 - more delivered clean air on the smoke CADR figure, 7 dB quieter at its lowest setting, and a sensor-driven auto mode the Medify does not have. Buy it for bedrooms, home offices and any room under about 360 sq ft. Buy the Medify MA-40 only for a stated reason: the H14-grade filter claim, the child lock, or a room the Coway's rating does not cover. Neither one has an app, so budget accordingly.
Read the full Coway AP-1512HH Mighty analysisAmazon links are affiliate links (tag: habilytics-20), at no extra cost to you. Scores are computed from verified specs and never influenced by commissions.