Best air purifier for a bedroom
For a bedroom, low-speed noise and the right size matter most.
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How this page was made: our picks are based on manufacturer specifications (product pages, manuals and spec sheets, all linked below) and aggregated owner reviews. We have not tested these products hands-on, and we do not publish invented test results, scores or star ratings. Read our methodology.
We compared purifiers on lowest published noise, CADR and rated room size so you can match one to your bedroom. This page is based on manufacturer-published specifications and manuals plus aggregated owner reviews; we did not test the products ourselves.
Quick picks
Spec comparison
| Model | CADR | Rated room | Lowest noise | Power | Ionizer |
|---|---|---|---|---|---|
| Levoit Core 300S | 141 CFM | 219 ft² (4.8 ACH) | 22 dB | 23W* | None |
| Levoit Core 400S | 231 CFM | 358 ft² (4.8 ACH) | 22 dB | 38W | None |
| Coway Airmega 250 | 261 CFM dust | 465 ft² (4 ACH) | 22 dB(A) | 64W | None listed |
| Winix A231 | 149 CFM dust | 246 ft² (4.8 ACH) | 25 dB | 55W | PlasmaWave, switchable |
The picks in detail
Levoit Core 300S
The Levoit Core 300S is rated for 219 ft² with a 22 dB low setting, in a small 8.7 in-square body.
Pros
- 22 dB low
- Small
- App schedules
Cons
- Manual and page disagree on power
Levoit Core 400S
The Levoit Core 400S keeps the 22 dB low setting with a 358 ft² rating and a PM2.5 sensor for auto mode.
Pros
- Bigger room rating
- Auto mode
Cons
- 20.5 in tall
Coway Airmega 250 (AP-1720H)
The Coway Airmega 250 lists 22 dB(A) on low with the most output here, for big or open bedrooms.
Pros
- Most output
- Smart mode
Cons
- 20.5 lb
- No Wi-Fi on base model
Winix A231
The Winix A231 needs no app and is rated for 246 ft²; its PlasmaWave ionizer can be switched off.
Pros
- No app
- 246 ft²
Cons
- 25 dB low
- 55W
Who should buy what
- Typical bedroom
The Levoit Core 300S.
- Large bedroom
The Levoit Core 400S.
- No Wi-Fi
The Winix A231.
Reading noise specs
Noise figures are maker-measured, usually at the lowest fan speed. Running a larger unit on low is often quieter than a small unit on high.
Frequently asked questions
What is the quietest bedroom purifier here?
Levoit and Coway list 22 dB on low.
Did you test it?
No. This page uses manufacturer specifications and aggregated owner reviews. See how we research.
Sources
Specifications were checked against the manufacturer pages, manuals and spec sheets below in October 2026. Makers revise specs and sell regional variants, so confirm the exact model number before you buy. We do not list prices because they change daily; use the retailer link to see the current price.
- Levoit: Core 300S-P Smart Air Purifier product page
- Levoit: Core 300S series user manual (PDF)
- Levoit: Core 400S-P Smart Air Purifier product page
- Levoit: Core 400S user manual (PDF)
- Levoit: air purifier comparison chart (PDF)
- Coway: Airmega 250 product page
- Winix America: A231 product page
- Winix: A230/A231 user manual (PDF)
Keep reading
Best air purifier for a dorm room
A typical dorm room is small, shared and short on floor space. You want a compact purifier sized for about 150–250 ft² that’s quiet enough to sleep next to.
Read the comparison Head to headAir PurifiersLevoit Core 300S vs Levoit Core 400S
Levoit’s bedroom purifier vs its larger sibling.
Read the comparison Head to headAir PurifiersLevoit vs Winix air purifier: Core 400S vs Winix 5500-2
Both are rated for a roughly 360 ft² room at 4.8 air changes an hour. One is an app-connected tower, the other a button-driven box with a washable carbon filter.
Read the comparison