trust me i have both models one is coway 150 and a philips AC2887/20
and philips does a much better job.
coway might be cheaper but its shit
It doesn't generally make sense to generalise brands but if you check all multi-brand reviews across geographies, the Coway ones are usually at the top.
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I do like Philips as a brand but each time I came up with the same issue where spares and accessories are either unavailable or overpriced.
Just something I found out while watching various youtube videos. Without real accurate PM 2.5 readings, that green light means nothing. The company could have set the green light to go off on a timer or on any AQI reading they wish. Most companies just resort to faking the AQI and red/green/blue light settings. And on a side note, I feel these air purifiers are just overpriced Chinese garbage.
The issue is true of every air purifier. The Philips and Mi ones with AQI readings are grossly inaccurate which is probably worse than having a 3-stage indicator. If it is such a concern, picking up one of the independent AQI meters for around 5k is a good option.
Relatively speaking, the filter does work differently in different conditions. For example, I find it switching on more frequently in the evening than at noon. Also, as per the reviews, those who purchased it in Delhi had the purifier running for 10 minutes before it went green, so really depends on the conditions in the room.