Which is better for a bedroom?

The Coway. It runs as quiet as 24 dB(A) and covers up to 361 square feet. The Dyson can heat and cool, but its fan at high speed is louder and it costs much more.

Does the Dyson replace a heater and a fan?

Yes. It heats a room and blows cooling air, and it purifies at the same time. The Coway only purifies, so you would still need separate heating and cooling.

Is the Coway's ozone a problem?

It emits 9 ppb from its ionizer, which is low. You can turn the ionizer off and rely on the HEPA and carbon filters alone.

Both are built to last years with filter changes. The Coway has a long track record and cheaper filters; the Dyson's 3.1-star rating suggests more owner complaints.

Is the Dyson worth the extra money?

Only if you need heating and cooling from the same unit and will use the app. For purification alone, the Coway does the job for far less.

Which cleans a larger room?

The Coway is rated for up to 361 square feet with a CADR of 248. Dyson does not publish a CADR for this model, so compare coverage claims carefully.

Dyson Purifier Hot+Cool HP11 vs Coway Airmega AP-1512HH Mighty

Buy the Coway Airmega AP-1512HH if you want a proven, quiet purifier for a bedroom or living room up to 361 square feet. Buy the Dyson Purifier Hot+Cool HP11 if you need one machine that heats, cools and purifies, and you will use the app and voice control. The Dyson costs far more and its 3.1-star rating from 1,000 ratings is a warning sign. Check current prices at each store before deciding, since the gap between them is large.

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