The Coway AP-1512HH Mighty is AHAM Verified for up to 361 square feet; the Levoit Eleva 300X tops out around 250 square feet. We compared both to see which True HEPA air purifier actually fits your room, and whether the extra coverage is worth the extra cost.
Our verdict
Get the Levoit Eleva 300X for a bedroom, nursery or home office; get the Coway Mighty only if you’re pointing it at a real living room.
Best overall
~$145–270
Get it if a living room, allergies or pet dander need real, verified coverage.
Best for bedrooms
~$120–150 Lowest price
Get it if the room is a bedroom, nursery or office under about 250 sq ft.
The price gapThe two ranges overlap
Each bar is an estimated price range, on one scale from ~$120 to ~$270.
Either way: These are sized for different rooms, not different budgets.
Dated notes already published on this page, newest first. Every correction we make is logged on the corrections page.
We compared Wirecutter’s decade-plus testing and AHAM Verified CADR figures for the Coway Mighty against Levoit’s own AHAM Verified numbers for the Eleva 300X, then checked both against the price ranges we publish. We haven’t run either purifier ourselves; the coverage figures come from AHAM Verified testing and Wirecutter’s own lab measurements, both linked where we cite them. Prices are always moving, so every button and link pulls the live listing.
How we rank
Published specifications, verified owner reviews, and independent safety or standards data where it applies — weighted the same for every pick, never sponsored placement.
Best overall~$145–270
The lab-test legend, sized for anyone with real allergies
Get it if a living room, allergies or pet dander need real, verified coverage.
Skip it if the room is a bedroom under 250 sq ft. The Eleva 300X costs less and fits better.
The Coway Mighty has topped Wirecutter’s testing for roughly a decade, an eternity in gadget years, because nothing at its price matches its AHAM Verified clean-air numbers: 246 CADR for dust, 240 for pollen and 233 for smoke, independently tested rather than self-reported. That verified rating is what lets it claim proper coverage up to 361 square feet, enough for an actual living room rather than the corner nearest the outlet.
The eco auto mode shuts the fan off entirely once air stays clean, a real electricity saver rivals at this price don’t match, and the True HEPA plus carbon combination handles both allergens and everyday odors.
Maintenance is straightforward and documented in Coway’s own manual: the washable pre-filter needs a rinse every two weeks, the deodorization filter lasts about six months, and the True HEPA layer itself is rated for a full year, with a genuine one-year filter pack running roughly $30 to $46 depending on retailer. Measured noise runs from about 24 decibels on its lowest setting up to the high 50s on turbo.
Against the Eleva 300X, the tradeoff is size and looks: it’s a bigger appliance with dated plastic styling and no app, buttons only. But for allergy sufferers or a pet-heavy living room, the extra coverage and verified CADR are the whole reason to pay the $145 to $230 on Amazon.
Strengths
Tradeoffs
Best for bedrooms~$120–150
The quieter, longer-ranged bedroom default
Get it if the room is a bedroom, nursery or office under about 250 sq ft.
Skip it if it’s a living room or open-plan space. Go Coway.
The Levoit Eleva 300X is Levoit’s replacement for the Core 300S in its bedroom tier, and the specs move in the right direction across the board: AHAM Verified CADR climbs to 161 CFM for smoke, dust and pollen, verified coverage grows to 250 square feet, and its sleep mode drops to 20 decibels, quieter than the model it replaces. The Levoit Eleva 300X runs sealed, system-level HEPA filtration rated to capture 99.97% of particles at 0.3 microns, the standard True HEPA benchmark.
The filter setup changes too: instead of one combined 3-in-1 cartridge, the Eleva splits a HEPA layer rated for up to two years ($39.99) from a separate activated-carbon filter rated six to twelve months ($19.99 to $34.99), so budget roughly $20 to $35 a year for carbon on top of the amortized HEPA cost — in the same range as the Coway’s filter pack rather than clearly cheaper. The VeSync app is new here too, adding real-time air-quality readings, overnight tracking and AI insight reports, and it works with third-party voice assistants.
At around $120–150 on Amazon, it’s still the correct, cheaper machine for anything under 250 square feet, and every published number beats the purifier it replaces. The Core 300S itself is no longer sold new: Levoit debuted the Eleva 300X in August 2026 as its bedroom-and-home-office model, and only replacement filters for the old unit remain listed.
Strengths
Tradeoffs
6 common questions, answered.
The Coway Mighty. Its AHAM Verified CADR scores support coverage up to 361 square feet, well past a typical living room. The Levoit Eleva 300X is verified only to about 250 square feet, a bedroom-sized number, and will underclean a bigger open space even running at full speed.
Yes. Both the Coway Mighty and the Levoit Eleva 300X use True HEPA layers alongside activated carbon, the combination that handles allergens and everyday odors together. The difference between them is room-size capacity and carbon mass, not filtration grade.
The Eleva 300X has the edge here: its sleep mode runs at 20 decibels, quieter than the Mighty’s roughly 24, and it’s purpose-built for the bedroom. The Mighty is quiet too, but its size and living-room mission make it a less natural nightstand companion.
The Coway’s genuine one-year filter pack, one HEPA and two carbon filters, runs roughly $30 to $46 depending on retailer. The Levoit Eleva 300X splits its filters instead of bundling them: the HEPA layer lasts up to two years at $39.99, and the separate carbon filter runs $19.99 to $34.99 with a six-to-twelve month life, so budget roughly $20 to $35 a year for carbon plus the amortized HEPA cost, similar in practice to the Coway.
For a living room or shared space, yes. Its higher, AHAM Verified CADR moves more air per hour through the filter, which lines up with EPA guidance on air cleaners: match the CADR to the room’s actual square footage, not just place a purifier somewhere in the room. For a bedroom alone, the Eleva 300X delivers the same allergen protection at a smaller scale.
It’s a legitimate option and roughly price-comparable to one Mighty, and it gives you two independently controlled rooms instead of one unit trying to cover both. The tradeoff is two sets of filters to track and replace instead of one, so factor that ongoing cost in before deciding.
Correction, 23 September 2026The Levoit Core 300S is no longer sold new, so this comparison now covers its successor, the Levoit Eleva 300X, at about $120–150. The title changed to match.Every correction we’ve made
