Dreo 338S vs 539S: Spend More for Airflow?
Automated research by Top10Scout editorial team · Not hands-on tested · Last verified 2026-10-05
Published · Updated
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We would start with the 539S when you want more published airflow and its extra cost is small. Choose 338S when it suits your room and you prefer to spend less. Both already have smart control and automatic purification, so the purchase should turn on room needs and airflow, not on whether one has an app. The figures below are manufacturer specifications, not our cleaning test.
Which differences matter in the same room?
The differences behind the purchase
| Decision point | Dreo 338S | Dreo 539S |
|---|---|---|
| US store reference | $99.99 USD | $109.99 USD |
| Maximum air volume | 115 CFM | 158 CFM |
| Advertised maximum area | 856 sq. ft | 1176 sq. ft |
| Timer | 12 Hours | 24 Hours |
| Smart control | Documented | Documented |
Dreo lists maximum air volume of 115 CFM for 338S and 158 CFM for 539S. Its advertised maximum room areas also increase. That makes 539S the more sensible candidate when you are choosing for a larger room, rather than paying solely for a longer features list.
Do not turn maximum airflow into a promise about cleaning at a quiet sleep setting. These pages do not provide our own noise-matched results, and we have not tested them in identical rooms. A higher maximum can be useful headroom, but you still need a fan setting you will leave running.
How should you read the coverage claims?
The headline areas are 856 sq. ft and 1176 sq. ft. A large maximum area describes a particular amount of air movement over time; it is not a guarantee of repeated cleaning throughout connected rooms. An open-plan space also behaves differently from a closed bedroom.
Write down the room you intend to serve and the main place the purifier will sit. Keep its intake and outlet clear. If a smaller purifier is already working on a low setting in a suitable room, replacing it for the largest printed area is less useful than choosing a consistent operating routine.
What does the extra money buy?
The checked white US configurations cost $99.99 USD for 338S and $109.99 USD for 539S. The larger-rated model has a listed hardware-price premium of $10.00. Tax, shipping and promotions can change checkout totals. At that gap, airflow is a more persuasive reason to pay than app access, which both already offer.
The timer also differs: 12 Hours versus 24 Hours. Treat that as a routine-specific convenience. We would not claim lower electricity bills without power and usage evidence for the exact settings being compared, and have not baked an assumed energy saving into the recommendation.
What remains the same after purchase?
Both document automatic purification, a particle display and replaceable filters. An app does not replace the physical maintenance: inspect a clogged filter, keep the air path clear and reset the reminder after a change. The running costs you should investigate are electricity and matching filters.
For an owner unhappy with performance, first rule out filter packaging, a blocked intake or an overloaded filter. Those are explicitly listed troubleshooting causes. Once those are addressed, a need for more maximum airflow is a stronger reason to change machines than a desire for a newer-looking control screen.
Our pick when the price gap is small
Choose 539S if you are buying for a larger room or want the higher published maximum airflow. Verify the space for the appliance and the filter supply before checkout. The recommendation rests on documented capacity indicators; it does not promise an identical increase at every speed.
When we would keep or buy 338S
Keep a 338S that serves its room comfortably, or buy it when its lower current price and room fit meet your needs. Both already have the smart-control route. An upgrade should solve a room or airflow problem, not simply add a model number to the shopping basket.
Frequently asked questions
Does 539S add smart control that 338S lacks?
No. Both are the smart variants in their respective series. The important comparison is their published maximum airflow, room claims and timer, rather than treating an app as an exclusive feature of the larger model.
Is the maximum CFM figure a sleep-mode result?
No sleep-mode airflow result is established by the listed maximum. Quiet operation changes the operating point. We have not performed a matched-noise test, so choose around the setting you expect to keep running.
Should I upgrade a working 338S?
Only when there is a clear reason, such as needing more capacity for a different room. First check the filter and placement. The full replacement purchase can be much larger than the price difference faced by a new buyer.
Are replacement filters part of the running cost?
Yes. Both include a filter initially, but that filter is a consumable. Check the exact replacement for the model and follow its reset instructions; smart monitoring does not remove the replacement task.
Official sources
Dreo 338S (DR-HAP008S): checked exact-model source and conditions — checked 2026-10-05
Dreo 539S (DR-HAP009S): checked exact-model source and conditions — checked 2026-10-05