Levoit Core 600S
#8 in Large roomsFull review
For big living rooms and open-plan spaces where a mid-size unit can’t keep up. Smaller rooms are better served by the Core 400S.
Amazon $259.97$259.97
The Levoit Core 600S is the better air purifier overall, rated 3.6 to 2.7. The Levoit Core 600S leads on value, filter cost and auto mode. The Levoit Core 600S costs $419.03 less ($259.97 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 Core 600S for value ($0.66 per cfm of smoke CADR vs $1.84 per cfm of smoke CADR), filter cost ($119.98 a year in filters vs $239.90 a year in filters) and auto mode (PM2.5 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 Core 600S | AirDoctor AD4000 |
|---|---|---|
| Overall rating | 3.6/5 | 2.7/5 |
| Value 25% | 82 $0.66 per cfm of smoke CADR | 0 $1.84 per cfm of smoke CADR |
| Filter cost 20% | 70 $119.98 a year in filters | 22 $239.90 a year in filters |
| Quiet 20% | 33 55 dB at top speed (maker rating) | 50 noise at top speed not published (neutral score used) |
| Efficiency 15% | 50 6 cfm per watt | 45 5.6 cfm per watt |
| Auto mode 10% | 100 PM2.5 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 Core 600S | AirDoctor AD4000 | |
|---|---|---|
| Performance | ||
| Smoke CADR | 391 cfm | 370 cfm |
| Dust CADR | 398 cfm | 393 cfm |
| Pollen CADR | 436 cfm | 450 cfm |
| PM2.5 CADR | 394 cfm | 381 cfm |
| CADR certified by | AHAM Verifide | ENERGY STAR |
| Room size (AHAM) | 606 sq ft | 574 sq ft |
| Coverage (maker) | 2,933 sq ft | 2,776 sq ft |
| Noise | 26 to 55 dB | - |
| Efficiency | ||
| Efficiency (IEF) | 6 cfm/W | 5.6 cfm/W |
| ENERGY STAR | Yes | Yes |
| Energy use | 378 kWh/year | 396.2 kWh/year |
| Power at top speed | 66 W | - |
| Filters | ||
| Filter | HEPA | UltraHEPA with carbon/VOC filter and pre-filter (single filter unit) |
| Activated carbon | Yes | Yes |
| Replacement | Core 600S-P Original Replacement Filter | AD4000 filter unit |
| Replacement cost | $59.99 every 6 months | $119.95 every 6 months |
| Yearly filter cost | $119.98/year | $239.90/year |
| Ionizer | No | - |
| CARB certified (ozone) | Yes | Yes |
| Controls and build | ||
| Air-quality sensor | PM2.5 laser | PM2.5 |
| Auto mode | Yes | Yes |
| Wi-Fi app | Yes | - |
| Fan speeds | 4 | 6 |
| Dimensions | 23.6 x 12.3 x 12.3 in | - |
| Weight | 13.7 lb | 15.8 lb |
| Warranty | 2 years | - |