tldr; Smart sensing beast with WiFi. Dual filtration, 1256 sq ft, app control. The connected Coway.
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Best praise vs top criticism for Coway Airmega 300S
“Airmega Jet is one of the best devices Coway has made. It has a bigger brother called Storm, that is the most quiet device they have made. Jet is just a bit noisier, but still very quiet. Filtersets are top class and they actually work, but in your case I’d use the basic GreenHepa + carbon (greenhepa is designed to fight allergens). I know yes, that airmega 300 has filters on 2 sides, but the size of those two is about the same size as 1 filter from the Jet. Also the jet has an extra blue-coloured filter in the set called “dust filter”, which collects most of the dust coming in after the pre-filter, which means more lifetime for the hepa-filter. I also love the extra feature where you can use the device as a fan. (Both Storm and Jet have this feature and it rules on hot summer days). My best friend is fighting allergies every year and Coway was the first one, that he had any help with. This company is focused on helping people with allergies and asthma. I’d pick the Jet.”
“Yeah, it sucks. I appreciate that Coway gives you numbers on how many air changes you can expect in a particular size room. I have no way of knowing it's accurate but some of these random air purifier companies on Amazon just throw in a big number for small ass purifier and people just trust it. There are 3 Coway reviews on House Fresh though: Airmega 1512hh, Airmega 150, and Airmega 300”
157 Reddit opinions analyzed • Last updated 2/24/2026