LEVOIT vs Winix
Two brands that dominate the mid-price shelf, separated less by hardware than by which certification register their numbers come from — and by one ion stage.
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Buy Winix if you want the most certified air for the money and you check the model for an ion stage first. Buy LEVOIT if you want a published noise figure, a published filter price and a measured zero on ozone across the whole range. The brands separate on documentation, not on quality.
These two own the shelf between about $120 and $250, and the comparison usually gets made on price and app features. That is the wrong axis. The useful difference is which certification register each brand files with, because the two registers publish different fields — and because one Winix product line carries something the LEVOIT Core range does not.
The registers they file with
Winix models are listed in AHAM VERIFIDE, which publishes certified CADR, a suggested room size and an energy figure. LEVOIT’s Core range is certified by ENERGY STAR, which publishes the same performance figures plus two that AHAM does not: a measured ozone emission and a filter classification. That is why this site can tell you a Core 400S measures 0.00 ppb and cannot tell you the same about most Winix units except through their ENERGY STAR entries.
That gap has narrowed. When we first read the registers on September 2, no LEVOIT Core unit was in AHAM’s directory. Re-reading it this month, both the Core 400S and the Core 600S are listed there as well, with figures within a few CFM of their ENERGY STAR entries — 234 smoke CADR and 363 sq ft for the 400S against 231 and 358. Where two registers disagree slightly we quote the more conservative figure, which is why the ENERGY STAR numbers are the ones in the table below.
Neither register is the soft one — both require testing to ANSI/AHAM AC-1 through an accredited body. But a machine listed in only one of them has fewer published fields, and a machine in neither has none at all, which is where most of this category actually sits.
Model by model, at matched size
| LEVOIT Core 400S | Winix AT41 | Winix C710 | LEVOIT Core 600S | |
|---|---|---|---|---|
| Smoke CADR | 231 CFM | 265 CFM | 248 CFM | 391 CFM |
| Certified room | 358 sq ft | 410 sq ft | 384 sq ft | 606 sq ft |
| Register | Both | AHAM | AHAM | Both |
| Annual energy | 237 kWh | 272 kWh | 235 kWh | 387 kWh |
| Electricity / yr | $43 | $50 | $43 | $71 |
| Air per watt | 5.8 CFM/W | 5.6 CFM/W | 6.2 CFM/W | 6 CFM/W |
| Measured ozone | 0.00 ppb | 0.00 ppb | 1 ppb | 0.00 ppb |
| Ion stage | None | None | None | None |
| Filter class | HEPA-Type | HEPA-Type | HEPA-Type | HEPA-Type |
| Published noise | 22-52 dB | Not published | Not published | 26-55 dB |
| Published filter price | $49.99 | Not published | Not published | $59.99 |
Electricity costs on this page use 18.34¢ per kWh, the U.S. average residential price for June 2026 from the U.S. Energy Information Administration, Electric Power Monthly, Table 5.3. Your rate is on your bill and is probably not this one; multiply the kWh figure by your own rate and you have your number.
Read across the top two rows and Winix wins the hardware comparison: the AT41 moves 15% more certified air than the Core 400S across 15% more certified room. Read the bottom two rows and LEVOIT wins the documentation comparison outright, because Winix publishes neither number for any model here.
The Winix caveat: check the line, not the brand
Winix sells two kinds of machine and the difference matters more than any spec on this page. The PlasmaWave models run a bipolar ion stage. ENERGY STAR records the T810 as “Fan and Filter, PlasmaWave” and measures 1.35 ppb of ozone — well under the 50 ppb program limit, but not the zero its stablemates return.
The AT41 and C710 carry no ion generator: AHAM classifies both “Fan with Filter”. If you buy Winix, you are choosing a model, not a brand. Every LEVOIT Core unit we cover is fan-and-filter with a measured zero, so the same question does not arise — why this site weights ozone the way it does.
What each brand tells you before you buy
LEVOIT publishes a dB range and a replacement filter price for every Core machine. Those are the two specifications buyers most often discover after purchase rather than before, and for a bedroom machine the bottom of the dB range is the number that decides whether it is still switched on in six months.
Winix publishes neither for the models here. We could source no noise figure and no filter price or interval for the AT41 or the C710, so their running cost stops at electricity. That is not an accusation — most of this category is the same — but it is a real difference from the brand sitting next to it on the shelf.
The axis nobody compares: staying buyable
A purifier is a five-year purchase with a recurring consumable, so the brand question includes a question about supply. Here the two diverge sharply, and it is visible in our own price pipeline.
Every LEVOIT Core machine we cover resolves to a live Amazon listing that names the model, with a filter sold under its own part number. Of the three Winix units on this page, none does. The 5500-2 is discontinued in the U.S. and Canada. For the AT41, the catalog offers the AT40 — a different certification entry, which we will not substitute. For the C710 we could find no listing at all. All three still fall back to a tagged search on this site rather than a product link, which is honest but is not the same as being able to buy the machine you read about.
That is not a statement about build quality, and Winix models remain widely sold through other channels. It does mean that if you buy Winix, you should confirm the exact model number on the box against the certified figures before ordering, and check that its filter is still stocked. With LEVOIT you can check both in about a minute, which is worth something on a machine you intend to keep.
Quick picks
The best-evidenced machine from each brand, plus the efficiency pick.
| # | Product | Best for | Certified CADR | Price |
|---|---|---|---|---|
| 1 |  Most certified air Winix AT41 265 certified CFM across 410 sq ft, no ion stage, 0.00 ppb measured. | Pet allergies, whole living room | 265CFM smoke AHAM VERIFIDE | |
| 2 |  Best documented LEVOIT Core 400S 231 certified CFM, 0.00 ppb, and both a dB range and a filter price published. | Popular pick, mid-size rooms | 231CFM smoke ENERGY STAR verified | |
| 3 |  Cheapest to run Winix C710 248 certified CFM at 6.2 CFM per watt — the efficiency pick of the four. | Lowest running cost at living-room size | 248CFM smoke AHAM VERIFIDE |
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The picks
Winix AT41
Winix · model AT41
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The best-evidenced pick for a pet household: the highest certified smoke CADR of any mid-price unit here, no ion generator, and a measured zero on ozone.
265 smoke / 259 dust / 244 pollen CFM · 261 PM2.5
- Certified room size
- 410 sq ft
- Energy / year
- 272 kWh
- Electricity / year
- $50
- Air per watt
- 5.6 CFM/W
- Power draw
- 45 W
- Noise
- Not published
- Measured ozone
- 0 ppb
- Filter class
- HEPA-Type
- AHAM rule, 400 sq ft
- Short (267 needed)
No ionizer — filtration only
AHAM classifies this model 'Fan with Filter' — no ion generator, unlike Winix's PlasmaWave line.
265 certified smoke CADR across 410 AHAM-certified square feet, no ion generator, and a 0.00 ppb ozone measurement carried on its ENERGY STAR sibling entry. It is the most certified air of any mid-price machine on this site, and it is the Winix to buy if the room is a living room rather than a bedroom.
The honest con: 5.6 CFM per watt is mid-pack, Winix publishes no noise figure and no filter price we could source, and the listing we can find is for the AT40 rather than the AT41 — so the buy button below is a search rather than a product link.
LEVOIT Core 400S
LEVOIT · model Core 400S (LAP-C401S)
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The best-selling unit in the category, and a clean example of the coverage gap: ENERGY STAR certifies it for 358 square feet while the box advertises 1,718.
231 smoke / 240 dust / 259 pollen CFM · 236 PM2.5
- Certified room size
- 358 sq ft
- Advertised coverage
- 1,718 sq ft at 1 air change per hour
- Energy / year
- 237 kWh
- Electricity / year
- $43
- Air per watt
- 5.8 CFM/W
- Power draw
- 38 W
- Noise
- 22-52 dB
- Measured ozone
- 0 ppb
- Filter class
- HEPA-Type
- AHAM rule, 350 sq ft
- Short (234 needed)
No ionizer — filtration only
ENERGY STAR classifies this unit 'Fan and Filter' and measures 0.00 ppb ozone. LEVOIT markets it as ozone free.
231 certified smoke CADR across 358 certified square feet, 0.00 ppb measured ozone, no ion stage, and both of the numbers Winix leaves blank: 22-52 dB and a $49.99 filter. The full record on it.
The honest con: less certified air than the Winix for similar money, 5.8 CFM per watt against the C710’s 6.2, and a filter the register classifies HEPA-Type despite the “True HEPA” box copy.
Winix C710
Winix · model C710
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Nearly the same air movement as the AT41 for a third less electricity a year. If you can find it, it is the cheapest certified 380-plus square-foot unit to run.
248 smoke / 252 dust / 262 pollen CFM · 250 PM2.5
- Certified room size
- 384 sq ft
- Energy / year
- 235 kWh
- Electricity / year
- $43
- Air per watt
- 6.2 CFM/W
- Power draw
- 45 W
- Noise
- Not published
- Measured ozone
- 1 ppb
- Filter class
- HEPA-Type
- AHAM rule, 380 sq ft
- Short (254 needed)
No ionizer — filtration only
AHAM classifies this model 'Fan with Filter'.
248 certified smoke CADR across 384 certified square feet at 6.2 CFM per watt — $43 a year, the lowest bill of anything in this comparison, with a real activated carbon stage for odor.
The honest con: ENERGY STAR measures 1 ppb rather than zero, Winix publishes no noise or filter figures for it either, and we could find no Amazon listing for it at all — so this one is a tagged search, not a product link. The C710 against the Coway most people buy.
The verdict
Common questions
Is LEVOIT or Winix better?
Do Winix air purifiers produce ozone?
Which brand is cheaper to run?
Are Winix filters more expensive than LEVOIT filters?
Sources
- AHAM VERIFIDE directory of certified room air cleaners
- ENERGY STAR certified room air cleaners database
- AHAM — air filtration standards and the two-thirds rule
Figures were read on the dates shown against each source. If one has changed, or if we have got something wrong, tell us and we will correct the page.
Read next
- CADR & costLEVOIT vs CowayBrand-level comparison on certified coverage, running cost and which models are actually in a register.
- Pet hair & odorBlueair vs WinixBlueair takes air-per-watt by a distance; Winix documents switchable PlasmaWave and washable pre-filters. Which matters depends on how much your animal sheds.
- CADR & costBlueair vs LEVOITBlueair wins air-per-watt by a distance. Every Blueair here also has an ion stage and a measured ozone figure; every LEVOIT reads 0.00.