Coway Airmega AP-1512HH vs Levoit Core 600S

Here's the trap to avoid first: the Levoit Core 600S is marketed for rooms up to roughly 2,900 sq ft, but that figure is measured at a single air change per hour — which does almost nothing for allergies, dust, or smoke. At the 4–5 air changes per hour the EPA actually recommends, the 600S realistically covers about 635 sq ft. The Coway AP-1512HH is rated for 361 sq ft and AHAM-certified at 216 sq ft at 4.8 air changes per hour — a smaller number, but an honestly tested one. That airflow gap is the whole story: in independent glass-box smoke tests the 600S cleared the chamber in about 9 seconds versus the Coway's 18, thanks to a smoke CADR near 410 CFM against the Coway's 233. It also adds a PM2.5 sensor, a VeSync app, and five fan speeds. The Coway counters with a quieter low setting (around 24 dB), a washable pre-filter, roughly 12-month filter life, and long-term reliability — though no Wi-Fi. Both share a genuinely useful Eco Mode that shuts the fan off entirely once the air is clean. Here's how to choose.