Levoit EverestAir
#13 in Large roomsFull review
A premium Levoit for a large room where floor space is tight. The Core 600S cleans a bit more air for less money if you have the floor space.
Amazon $499.99$499.99
The Levoit EverestAir is the better air purifier overall, rated 3.0 to 2.7. The Levoit EverestAir leads on filter cost, value and auto mode. The Levoit EverestAir costs $179.01 less ($499.99 vs $679).
AirDoctor AD4000
#15 in Large roomsFull review
A large-room purifier with strong certified CADR and odor filtration, but high filter costs.
Amazon $679$679
Prices were last checked October 22, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the Levoit EverestAir for filter cost ($99.99 a year in filters vs $239.90 a year in filters), value ($1.41 per cfm of smoke CADR vs $1.84 per cfm of smoke CADR) and auto mode (PM1/PM2.5/PM10 laser sensor and Wi-Fi app vs PM2.5 sensor, auto mode).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every large rooms air purifier; a clear win is highlighted. How we rank explains each one.
| Factor weight | Levoit EverestAir | AirDoctor AD4000 |
|---|---|---|
| Overall rating | 3.0/5 | 2.7/5 |
| Value 25% | 17 $1.41 per cfm of smoke CADR | 0 $1.84 per cfm of smoke CADR |
| Filter cost 20% | 74 $99.99 a year in filters | 22 $239.90 a year in filters |
| Quiet 20% | 27 56 dB at top speed (maker rating) | 50 noise at top speed not published (neutral score used) |
| Efficiency 15% | 41 5.3 cfm per watt | 45 5.6 cfm per watt |
| Auto mode 10% | 100 PM1/PM2.5/PM10 laser sensor and Wi-Fi app | 70 PM2.5 sensor, auto mode |
| Warranty 10% | 25 2-year warranty | 50 warranty not published (neutral score used) |
Specifications
| Levoit EverestAir | AirDoctor AD4000 | |
|---|---|---|
| Performance | ||
| Smoke CADR | 354 cfm | 370 cfm |
| Dust CADR | 373 cfm | 393 cfm |
| Pollen CADR | 431 cfm | 450 cfm |
| PM2.5 CADR | 363 cfm | 381 cfm |
| CADR certified by | AHAM Verifide | ENERGY STAR |
| Room size (AHAM) | 549 sq ft | 574 sq ft |
| Coverage (maker) | - | 2,776 sq ft |
| Noise | 24 to 56 dB | - |
| Efficiency | ||
| Efficiency (IEF) | 5.3 cfm/W | 5.6 cfm/W |
| ENERGY STAR | No | Yes |
| Energy use | 404 kWh/year | 396.2 kWh/year |
| Power at top speed | 70 W | - |
| Filters | ||
| Filter | HEPA | UltraHEPA with carbon/VOC filter and pre-filter (single filter unit) |
| Activated carbon | Yes | Yes |
| Replacement | EverestAir-P replacement filter | AD4000 filter unit |
| Replacement cost | $99.99 every 12 months | $119.95 every 6 months |
| Yearly filter cost | $99.99/year | $239.90/year |
| Ionizer | No | - |
| CARB certified (ozone) | Yes | Yes |
| Controls and build | ||
| Air-quality sensor | PM1/PM2.5/PM10 laser | PM2.5 |
| Auto mode | Yes | Yes |
| Wi-Fi app | Yes | - |
| Fan speeds | 3 | 6 |
| Dimensions | 23.2 x 18.9 x 8.5 in | - |
| Weight | 20.7 lb | 15.8 lb |
| Warranty | 2 years | - |