ApplianceRank
Head-to-Head Comparison

Dyson Big Quiet vs Coway Airmega 250

D
Dyson Purifier Big Quiet Formaldehyde

Dyson

9.0/10(982 reviews)
$749
on Amazon
Amazon PricePaid link. Price and availability are confirmed on Amazon.
C
Coway Airmega 250

Coway

9.2/10(3,421 reviews)
$299$349-14%
on Amazon
Amazon PricePaid link. Price and availability are confirmed on Amazon.
Spec
Dyson
Coway
CADR
Not AHAM rated
250 CFM
Noise
56 dB max
24-52 dB
Smart
Dyson Link app, Alexa
Coverage
1076 sq. ft.
930 sq. ft.
Filtration
HEPA H13 + Catalytic
True HEPA + Activated Carbon
Filter Life
12 months

Dyson Purifier Big Quiet Formaldehyde

Pros

  • +Massive room coverage
  • +Formaldehyde destruction is unique
  • +Very quiet for its power
  • +Real-time air quality monitoring

Cons

  • Expensive
  • Large footprint
  • Replacement HEPA filters are pricey

Coway Airmega 250

Pros

  • +Great value for performance
  • +Clear air quality indicator
  • +Filter replacement indicator
  • +Energy efficient — runs 24/7 cheap

Cons

  • Design is a bit plain
  • No app or smart features
  • Fan noise noticeable on high

⚖️ Our Verdict

The Coway Airmega 250 delivers 90% of the performance at 40% of the price. The Dyson is worth it only if you need formaldehyde destruction or want the premium design.

Dyson Purifier Big Quiet Formaldehyde

$749

Check Amazon PricePaid link. Price and availability are confirmed on Amazon.

Coway Airmega 250

$299

Check Amazon PricePaid link. Price and availability are confirmed on Amazon.