Name: COWAY Air Purifiers for Home Large Room Up to 1,860 ft², Washable Pre-Filter and True HEPA Filter for Smoke, Allergies, Pet Dander, Odor, AQI, Smar...
Brand: Coway
SKU: B08H4DZ5MD
Price: 317.38 USD
Availability: InStock
Rating: 4.4 (7756 reviews)

Our Verdict

Coway 400(G) Wins

COWAY Air Purifiers for Home Large Room Up to 3,120ft², 2 Sets of Washable Pre-Filters and True HEPA Filters for Smoke, Allergies, Pet Dander, Odor, AQI, Auto & Sleep Mode, Timer, 5yr Warranty, 400(G) 400 GRAPHITE - High-End Air Purifiers

Its smoke CADR is 416.0 vs 248.0, covering 650.0 sq ft versus 387.5 sq ft. Choose Coway 250 for smaller spaces or if a 22.0 dB minimum noise level isn't a concern, as its noise isn't specified.

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Bottom Line: Coway 400(G) is the better choice. Its smoke CADR is 416.

Key Differences

The most significant spec differences at a glance

248

Cadr Smoke

40% less

416

387.5

Coverage Sq Ft

40% less

650

Advantages

Where each product wins

Coway

Cadr Smoke: 40% higher (248.0 vs 416.0)
Coverage Sq Ft: 40% higher (387.5 vs 650.0)

Who Should Buy Which?

Find the right product for your needs

Buy Coway if...

COWAY Air Purifiers for

The Coway 250 is ideal for the budget-conscious consumer living in a medium-sized apartment or individual rooms up to 387.5 sq ft. If you prioritize excellent core purification (removes 99.999% of 0.01-micron particles) without overspending, this model is a great choice. Its washable pre-filter helps reduce recurring costs, and the smart sensor offers convenient automatic adjustments, making it a reliable and economical solution for everyday air quality improvement.

Buy Coway if...

COWAY Air Purifiers for

The Coway 400(G) is perfect for those with large open-plan homes, lofts, or multiple interconnected rooms, needing robust air purification for up to 650 sq ft. If you prioritize maximum purification power (CADR Smoke 416), advanced features like Eco Mode, and a longer 5-year warranty, the higher investment is worthwhile. This buyer seeks comprehensive air quality management for significant spaces, valuing superior performance and durability over initial cost savings.

Spec Comparison

7 specs compared

Specification	Coway Air Purifiers for	Coway Air Purifiers for
Price	$317	$649
Rating	4.4(7.8k)	4.4(6.5k)
Cadr Smoke	248	416
Coverage Sq Ft	387.5	650
Noise Level db Min	—	22 dB
Filter Type	True HEPA	True HEPA
Smart Sensor	Yes	Yes
Weight	—	3.05 lbs
Energy Star	—	Yes

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Pros & Cons

Quick overview of strengths and weaknesses

Coway Air Purifiers

Pros

Covers 387 sq ft for 5 air changes per hour.
Removes 99.999% of 0.01-micron particles.
Reduces 99% of volatile organic compounds.
Automatically adjusts fan speed to air quality.

Cons

Requires periodic replacement of internal filters.
Advertised coverage exceeds typical 5 ACH standard.

Coway Air Purifiers

Pros

Removes 99.999% of 0.01-micron particles.
Covers 780 sq ft with 4 air changes per hour.
Smart Mode adjusts fan speed based on air quality.
Eco Mode shuts off fan when air is clean.

Cons

Stated 3,120 sq ft coverage misleading for 4 ACH.
True HEPA filters require periodic replacement.
No remote control listed in features.

Frequently Asked Questions

Common questions about this comparison

Which air purifier is better for large rooms or severe allergies?

The Coway 400(G) is better for large rooms, covering 650.0 sq ft compared to the Coway 250's 387.5 sq ft. Both effectively remove 99.999% of 0.01-micron particles, making them suitable for allergies.

What is the main difference in their smoke CADR and coverage area?

The Coway 400(G) has a significantly higher smoke CADR of 416.0, compared to 248.0 for the Coway 250. This allows the 400(G) to clean air faster in its larger recommended coverage area of 650.0 sq ft, versus the 250's 387.5 sq ft.

Is the higher capacity of the Coway 400(G) worth the potential price difference?

Yes, the Coway 400(G) generally offers better value for larger spaces or if you prioritize faster air purification due to its higher CADR (416.0 vs 248.0) and coverage (650.0 sq ft vs 387.5 sq ft). It also has a longer 5-year warranty.

Which unit offers a quieter operation or better warranty?

The Coway 400(G) lists a minimum noise level of 22.0 dB, suggesting quiet operation, especially for bedrooms. It also comes with a longer 5-year warranty, compared to the Coway 250's 3-year warranty.