Side-by-side comparison based on expert reviews and community consensus.
Coway Airmega 400S
Best for Large RoomsWinix 5500-2
Most VersatilePrice
$280-$380
$150-$200
Summary
The go-to pick when you need serious coverage for open-plan pet homes. Handles large spaces up to 1,560 sq ft and adds smart app control the base Mighty lacks.
A perennial Reddit favorite for pet households that pairs true HEPA filtration with an activated carbon filter for odor control — critical if your pets have that distinct smell. Handles mid-to-large rooms with 4-stage filtration.
Pros
- Covers large areas — handles big open-plan rooms where pets spend most time
- Smart app control for monitoring and scheduling
- Dual inlet design pulls air from two sides for faster filtration
- Washable pre-filter to capture pet hair before HEPA stage
- 4-stage filtration including activated carbon for pet odors
- Consistently recommended on Reddit pet-owner threads alongside Coway
- Auto mode with air quality sensor adjusts fan based on real-time conditions
- Washable pre-filter for pet hair reduces replacement filter costs
Cons
- Significantly more expensive than the base Coway Mighty
- Replacement filters cost more than smaller models
- Bulkier footprint — harder to move between rooms
- Bulkier design than Levoit or Coway Mighty
- PlasmaWave feature controversial — some users disable it over ozone concerns
- No dedicated app — limited smart home integration compared to 400S or 300S
Our take
If you have a big living room where your pets roam freely, the 400S is worth the upgrade — it's the Mighty's bigger, smarter sibling and Reddit loves it almost as much.
If pet odors are your main complaint alongside hair and dander, the Winix 5500-2 is the pick — its carbon layer does what the Coway Mighty's can't match at a similar price.
Buy
