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)

$499.99

Price: $499.99
(as of Nov 30, 2025 05:26:45 UTC – Details)


The most advanced air purifier developed by copay. Coway Airmega 400 is a powerful air purifier, that intelligently, effectively and quietly cleans the air in your home. HyperCaptive filtration system removes 99.999% of particulate matter from the air, while the accompanying pollution indicator allows you to monitor and manage air quality real-time. The Coway Airmega 400 model features smart mode (auto, sleep, eco) and real-time air quality monitoring, so you can rest assured that the Coway Airmega 400 is at work at all times. Coway Airmega 400 cleans and maintains spaces up to 1,560 sq. ft. in 30 minutes.
[Coverage] Designed to clean spaces up to 1,560 sq. ft. in 30 minutes.
[HyperCaptive Filtration System] Combination of a pre-filter, deodorization filter, and True HEPA Filter reduces 99.999% of 0.01-micron particles, including pollen and other allergens; It also reduces 99% of volatile organic compounds and odor.
[Smart Mode] With its Smart Mode feature, the Airmega automatically adapts to its surroundings by adjusting fan speeds based on the room’s air quality; That means your unit is energy efficient without compromising effectiveness.
[Eco Mdoe] When the air quality in the room remains purified for 30 minutes or more in Eco Mode, the fan will turn off to conserve energy, kicking on again when pollution is detected.
[Sleep Mode] When the Airmega’s built-in light and pollution sensors detect that the room has been dark and the air clean for 3 minutes, Sleep Mode reduces the purifier’s noise and power consumption.
[Air Quality Indicator] 24/7 pollution monitor air quality throughout the day, adjusting purification to the necessary level and saving energy when it’s not needed.
[Filter Alerts] The air filter indicator tells you when the filters need to be replaced and the prefilters need to be cleaned for maximum efficiency, based on how much air they have processed.
[Timer] Schedule the unit to purify for 1, 4, or 8 hours of use and conserve energy.
[Warranty] 5-year Limited Manufacturer’s Warranty
4 air changes/hr.** 780 ft² (72 m²)

Customers say

Customers find the air purifier effective, noting it works well in auto mode, is super quiet, and eliminates cooking and pet odors. They appreciate its ease of use, taking only 2 minutes to set up, and its ability to clean large spaces up to 2,300 square feet. Customers like its appearance, with one mentioning it looks almost brand new after 90 days of use, and consider it worth the cost, though some note the replacement filters are expensive.