The Dreo 539S is the stronger purifier and the Levoit Core 300S is the safer bet. For about the same $100, the Dreo moves 12% more air (158 vs 141 CFM) and shows a live PM2.5 number; the Levoit brings years of owner history, an H13 filter and a display that turns fully off. Below about 220 sq ft either works, and between 220 and 245 sq ft only the Dreo is big enough.
The short answer
Choose the Dreo 539S if your room is 220 to 245 sq ft, you like seeing a particle reading on the front of the unit, or you find it on sale in the $70s. RTINGS also measured it clearing a room faster.
Choose the Core 300S if someone sleeps in a room under about 220 sq ft, because its display can go completely dark. It is also the pick if a long track record and an easy-to-find filter matter more than the extra airflow.
| On paper | Dreo 539S (DR-HAP009S) | Levoit Core 300S |
|---|---|---|
| CADR | 158 CFM (AHAM Verifide) | 141 CFM smoke |
| Room at 4.8 air changes/hr | ~245 sq ft | ~219 sq ft |
| Rated noise | 18 dB Sleep; top not published | 24–50 dB |
| Power | Not published; Energy Star figure ~162 kWh/yr | 24 W maximum |
| Filter | Dreo 3-in-1 for 539/539S, $29.99 | Core 300 filter, about $25–$35 |
| Filter interval (maker) | 6–8 months | 6–8 months |
| HEPA grade | 99.97% at 0.3 µm claimed; grade not published | H13 True HEPA |
| Air quality display | Numeric PM2.5 | Air quality sensor and auto mode |
| Display fully off | No, dims only (RTINGS) | Yes |
| Turbo speed | App only (RTINGS) | — |
| Ionizer | None listed; CARB certified | None |
| Typical price | $75–$110 ($109.99 list) | $90–$110 |
Where the Dreo 539S has the edge
More air for the money. The 158 CFM figure is AHAM Verifide, and it is backed by an independent result: in RTINGS's side-by-side, the 539S cleaned its test room about 20% faster than the Core 300S on top speed. That lines up with the paper gap.
A number you can act on. The front panel shows PM2.5 as a figure rather than a color. When a candle or a pan of onions spikes the room, you see by how much, and you can judge whether Auto mode is responding.
A published energy figure. Dreo's listing carries an Energy Star estimate of about 162 kWh a year, about $28 at $0.17/kWh. For the Core 300S, the only published power number is its 24 W maximum.
Sale pricing. List is $109.99 at Dreo, but it has been seen between about $71 and $77 elsewhere. At that price it undercuts the Core 300S's usual $90 to $110.
Where the Core 300S has the edge
A display that switches off. RTINGS found the 539S's display can be dimmed but not turned off. For a light sleeper, a glowing number at eye level can matter more than 17 CFM. The Core 300S goes fully dark.
A known quantity. The 300S has years of owner reviews behind it; the 539S is new, with very few so far, and Dreo's US store lists a 12-month warranty for new units, where Levoit's usually runs two years. Its spec sheet also skips the dust and pollen CADR breakdown, the wattage and any top-speed noise figure.
One less quirk. RTINGS reports that the 539S puts Turbo only in the app. If a partner or guest doesn't use the Dreo app, top speed is hidden from them, though Auto mode still ramps up on its own.
A stated filter grade. The Core 300S uses H13 True HEPA. Dreo claims 99.97% capture at 0.3 microns without naming a grade. Our explainer on HEPA grades from H11 to H14 covers what the label adds.
The 25 sq ft that decide it
At 4.8 air changes an hour with 8 ft ceilings, the Dreo covers about 245 sq ft and the Levoit about 219. Here is how that plays out at full speed:
| Room | Dreo 539S | Core 300S |
|---|---|---|
| 8 x 12 dorm room or office (96 sq ft) | 12.3 changes/hr | 11.0 |
| 12 x 12 bedroom (144 sq ft) | 8.2 | 7.3 |
| 12 x 15 bedroom (180 sq ft) | 6.6 | 5.9 |
| 14 x 17 bedroom (238 sq ft) | 5.0 | 4.4, a little short |
| 15 x 18 bedroom (270 sq ft) | 4.4, a little short | 3.9, short |
In a 12 x 12 room, the Dreo's extra headroom mainly means it can idle a notch lower for the same result. The deciding band is roughly 220 to 245 sq ft, the size of many primary bedrooms, where the Dreo still meets the target and the Levoit runs flat out to fall short. Ceiling height shifts the line: at 9 ft, the limits drop to about 218 and 194 sq ft. Plug your own length, width and ceiling into the room size calculator.
Dreo's box says 1,176 sq ft. That figure assumes one air change an hour, under a quarter of the rate this page sizes for.
Three-year cost, side by side
Assumptions: the first filter comes in the box, and both makers' 6 to 8 month interval means four replacements in three years at 8 months or five at about 7 months. Prices are each unit's usual range.
| Three years | Dreo 539S | Levoit Core 300S |
|---|---|---|
| Purchase | $75–$110 | $90–$110 |
| Filters, 4 to 5 replacements | $120–$150 (at $29.99) | $100–$175 (at $25–$35) |
| Purchase + filters | $195–$260 | $190–$285 |
| Electricity | ~$83 (Energy Star estimate) | Up to ~$107 (24 W, 24/7 ceiling) |
Before electricity, the two ranges almost overlap completely, so cost won't settle this. The electricity row isn't a fair contest either: Dreo's figure is an Energy Star estimate based on a set daily runtime, while the Levoit number assumes full power around the clock, which no bedroom needs.
One caveat on the Levoit filter: our Core 300S page quotes about $30 a year, which only holds if one filter stretches to a full year. On Levoit's own 6 to 8 month schedule, the Levoit Core 300 Replacement Filter works out to about $45 to $60 a year, close to the Dreo's roughly $50.
Easy-to-miss differences
Know which 539 you are buying. The 539 (DR-HAP009) is the same purifier without Wi-Fi and takes the same filter. The 539AS (DR-HAP009AS) is a pet edition that needs the pricier HEPA Pro filter. Dreo's older Macro models are a separate line. The genuine Dreo 539S Replacement Filter comes in white and black to match the housing; color is the only difference.
Core 300 versus Core 300S. Same filter, same cleaning; the S adds the app, scheduling and voice control.
Noise can't be ranked from the spec sheets. Dreo's 18 dB and Levoit's 24 dB are makers' figures on unknown bases, and Dreo gives no top-speed number. What RTINGS does report is that the 539S is louder than Dreo's own smaller 338S.
Neither suits heavy odors. Each uses a single cylinder with a thin carbon layer. A smoker's room needs a bigger carbon stage than either offers.
Which one to buy
For a bedroom of about 150 sq ft where someone sleeps, buy the Core 300S: its dark display and long record outweigh airflow it doesn't need. For a room of 200 to 245 sq ft, a home office, or anyone who wants a PM2.5 readout, buy the Dreo 539S, especially near its sale price. Our best air purifiers for bedrooms list has more options at this size.
If the room is smaller than 180 sq ft and the budget is tight, the Dreo 338S (115 CFM, about 178 sq ft) costs less. If the room is bigger than 245 sq ft, skip both: the Levoit Vital 200S-P covers about 388 sq ft, and the Winix 5530 about 392.
Frequently asked questions
Is the Dreo 539S louder than the Levoit Core 300S?
There isn't enough published data to say. Dreo quotes 18 dB in Sleep and no top-speed figure; Levoit rates the Core 300S at 24 to 50 dB. Those are makers' numbers on unknown bases, so the lower Dreo floor shouldn't be read as proof it is quieter.
Does the Dreo 539S filter fit the Dreo 539AS?
No. The 539 and 539S share Dreo's 3-in-1 HEPA filter at $29.99, but the pet-focused 539AS and the 530S take the 3-in-1 HEPA Pro filter, listed at $38.99. Check the model code (DR-HAP009S for the 539S) on the unit's label before ordering.
Is the Core 300 filter the same one the Core 300S uses?
Yes. The S adds Wi-Fi, the VeSync app and scheduling; the filter and the cleaning hardware are the same. Neither filter fits the Levoit Core 400S-P or Core 600S.
Can either one handle a 300 sq ft living room?
Not well. At full speed the Dreo gives a 300 sq ft room about 4.0 air changes an hour and the Core 300S about 3.5, both below the 4.8 this site sizes for. A room that size needs something in the Levoit Vital 200S-P or Winix 5530 class.
Which is better for allergies?
For pollen and dust in a room either one is sized for, they are close. The Core 300S uses an H13 True HEPA filter; Dreo states 99.97% capture at 0.3 microns but doesn't publish a grade. The Dreo's extra airflow helps most in rooms between about 220 and 245 sq ft.