Our Verdict
Coway Airmega 400 Wins

It covers a significantly larger area (1,560 sq ft) and is quieter, with a minimum noise level of 22 dB. Choose Nuwave Oxypure for its higher CADR of 390.87 and zero filter replacement cost for 5 years.
Bottom Line: Coway Airmega 400 is the better choice. It covers a significantly larger area (1,560 sq ft) and is quieter, with a minimum noise level of 22 dB.
Key Differences
The most significant spec differences at a glance
Cadr Smoke
16% lessCoverage Sq Ft
155% moreNoise Level Db Min
30% lessAdvantages
Where each product wins
Coway
- Coverage Sq Ft: 155% higher (1560.0 vs 610.73)
Nuwave
- Cadr Smoke: 16% higher (328.0 vs 390.87)
- Noise Level Db Min: 30% higher (22.0 vs 31.4)
Who Should Buy Which?
Find the right product for your needs
Buy Coway if...
Coway AP-2015F Airmega 400
The ideal buyer for the Coway Airmega 400 is someone with large open-concept living areas or multiple rooms to purify, prioritizing extensive coverage up to 1,560 sq ft. They value quiet operation, with a minimum noise level of 22 dB, ensuring minimal disruption. This buyer also appreciates smart features like automatic fan speed adjustments and energy-saving modes, even if it means periodic filter replacements. They seek comprehensive filtration for 0.01-micron particles and VOCs, making it perfect for those wanting broad, quiet, and effective air quality management.
Buy Nuwave if...
Nuwave Whole House Air
The Nuwave Oxypure is best for users who prioritize rapid air purification and long-term cost savings on filters. With a high CADR of 390.87, it quickly cleans air in its 610.73 sq ft coverage. The key differentiator is the zero filter replacement cost for the first five years, appealing to budget-conscious individuals who dislike recurring expenses. This buyer also values advanced features like Wi-Fi connectivity, dual sensors for particles and odors, and ozone elimination, making it a good fit for tech-savvy consumers seeking efficient, maintenance-friendly air purification for medium-sized spaces.
Spec Comparison
11 specs compared
| Specification | ![]() | ![]() |
|---|---|---|
| Price | $349 | $630 |
| Rating | 4.4(6.5k) | 4.5(2.8k) |
| Cadr Smoke | 328 | 390.87 |
| Coverage Sq Ft | 1560 | 610.73 |
| Noise Level db Min | 22 dB | 31.4 dB |
| Weight | 24.7 lbs | — |
| Energy Star | Yes | — |
| Filter Type | True HEPA | True HEPA and Carbon |
| Smart Sensor | Yes | Yes |
| Noise Level db Max | 52 dB | — |
| WiFi | — | Yes |
| Filter Cost Yearly | — | Free |
| Filter Life Months | — | 12 |
Swipe horizontally to see all columns
Pros & Cons
Quick overview of strengths and weaknesses
Coway AP-2015F Airmega
- Covers 1,560 sq. ft. in 30 minutes.
- Filters 99.999% of 0.01-micron airborne particles.
- Reduces 99% of VOCs and odors effectively.
- Automatically adjusts fan speed to optimize air quality.
- Maximum noise level reaches 52 dB.
- Requires periodic filter replacement and cleaning.
- Unit weighs 24.7 lbs.
Nuwave Whole House
- Purifies 2934 sq ft in 60 mins (CADR 664.6 m 3/h).
- Removes 100% of 0.09-micron airborne particles.
- Eliminates ozone to less than 1 ppb.
- Zero filter replacement cost for first 5 years.
- High power consumption at 125W-128W.
- Normal operating noise level not specified.
- True HEPA/Carbon filter requires annual replacement.
Frequently Asked Questions
Common questions about this comparison
Which air purifier is better for very large spaces?
The Coway Airmega 400 is superior for large spaces, covering up to 1,560 sq ft in 30 minutes. The Nuwave Oxypure covers 610.73 sq ft, making Coway more suitable for extensive areas.
What is the main difference in noise level between the two products?
The Coway Airmega 400 is significantly quieter, operating as low as 22 dB. The Nuwave Oxypure has a minimum noise level of 31.4 dB, which is noticeably louder at its lowest setting.
Is the price difference worth it considering ongoing costs?
While Coway is slightly more expensive initially, Nuwave offers zero filter replacement costs for the first 5 years, potentially leading to long-term savings on maintenance for the Nuwave despite its higher power consumption.
Which product removes airborne particles faster?
The Nuwave Oxypure has a higher CADR (Clean Air Delivery Rate) for smoke at 390.87. This indicates it can purify air of particles faster within its specified coverage area compared to Coway's CADR of 328.
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