Our Verdict
Coway Airmega AP-1512HH(W) Wins

It offers significantly better purification with CADR smoke 233 for 361 sq ft, compared to Shark's CADR 67 for 104 sq ft. Choose Shark HC451 for its integrated heating and fan functions.
Bottom Line: Coway Airmega AP-1512HH(W) is the better choice. It offers significantly better purification with CADR smoke 233 for 361 sq ft, compared to Shark's CADR 67 for 104 sq ft.
Key Differences
The most significant spec differences at a glance
Cadr Smoke
249% moreCoverage Sq Ft
247% moreAdvantages
Where each product wins
Coway
- Cadr Smoke: 249% higher (233.0 vs 66.67)
- Coverage Sq Ft: 247% higher (361.0 vs 104.17)
Who Should Buy Which?
Find the right product for your needs
Buy Coway if...
Coway Airmega AP-1512HH(W) True
The Coway Airmega AP-1512HH(W) is ideal for individuals who prioritize comprehensive and efficient air purification for medium to large spaces. If you need to effectively clean the air in living rooms, open-plan areas, or master bedrooms up to 361 sq ft, this is your choice. Its superior CADR smoke of 233 ensures faster air turnover, crucial for allergy sufferers or those concerned with indoor pollutants and VOCs. Buyers will appreciate its smart features like real-time air quality monitoring and Auto mode for hassle-free operation, providing peace of mind about their indoor air.
Buy Shark if...
Shark HC451 3-in-1 Clean
The Shark HC451 is perfect for individuals seeking a versatile, space-saving solution for smaller personal areas like a bedroom, nursery, or home office. If you need more than just air purification and desire the added convenience of supplemental heating and a cooling fan in a single compact unit, the Shark is an excellent fit. Its quiet operation and dimmable lights make it ideal for sleep environments. While its 104 sq ft coverage and CADR smoke of 66.67 are modest, its multi-functional design at a competitive price offers great value for targeted personal comfort and air quality.
Spec Comparison
8 specs compared
| Specification | ![]() | ![]() |
|---|---|---|
| Price | $220 | $200 |
| Rating | 4.6(28.0k) | 4.3(355) |
| Cadr Smoke | 233 | 66.67 |
| Coverage Sq Ft | 361 | 104.17 |
| Noise Level db Min | 24.4 dB | — |
| Weight | 12.5 lbs | — |
| Filter Type | True HEPA | Nanoseal HEPA |
| Smart Sensor | Yes | Yes |
| Noise Level db Max | 53.8 dB | — |
| Model Number | — | HC451 |
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Pros & Cons
Quick overview of strengths and weaknesses
Coway Airmega AP-1512HH(W)
- Covers rooms up to 361 sq ft (CADR smoke 233)
- Four-stage filtration, 99.97% of 0.3 micron particles
- Reduces VOCs and odors
- Real-time air quality monitoring with LED
- Max noise level is 53.8 dB, audible in quiet settings
- Filters are not covered by manufacturer's warranty
- Limited warranty: 1 year parts, 3 year motor
Shark HC451 3-in-1
- Purifies air, heats rooms, and provides fan cooling.
- Nanoseal filter captures 99.98% of airborne particles.
- Clean Sense IQ auto-adjusts purification power.
- Operates quietly with dimmable lights for sleep.
- Effective purification covers only 104 sq ft.
- Low CADR of 67 for smoke limits purification speed.
- Requires periodic filter replacements, adds cost.
Frequently Asked Questions
Common questions about this comparison
Which air purifier is better for large rooms?
The Coway Airmega AP-1512HH(W) is superior for larger rooms, covering up to 361 sq ft with a CADR smoke of 233. The Shark HC451 is only effective for smaller rooms up to 104 sq ft, with a CADR smoke of 67.
What's the main difference in purification efficiency?
The Coway Airmega AP-1512HH(W) offers much stronger purification with a CADR smoke of 233, effectively cleaning a 361 sq ft space. The Shark HC451 has a CADR smoke of 67, suitable for only 104 sq ft.
Does either product offer extra functions besides air purification?
Yes, the Shark HC451 is a 3-in-1 unit, functioning as an air purifier, heater, and fan. The Coway Airmega AP-1512HH(W) focuses solely on advanced air purification with smart modes and real-time monitoring.
How do their noise levels compare?
The Coway Airmega AP-1512HH(W) operates quietly, with a minimum noise level of 24.4 dB, ideal for bedrooms. The Shark HC451 claims quiet operation with dimmable lights for sleep, but a specific minimum dB level is not provided.
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