Ever since the mad winter of 2016 where Gurgaon practically choked on Diwali, we have had a few air purifiers. This is my comparison after a long term usage:
|Parameter||Kent Eternal||Honeywell A5||Philips AC1215|
|Price (‘000)||19 (2016 Nov)||9 (Nov 2017)||9 (Nov 2017)|
|HEPA||H13?||E11 (95%)||H14 (99.97%)|
In retrospect, I would happily purchase another Philips even though it has two idiosyncrasies: frequent filter cleaning requests, auto-switch-off LED display (not auto dimming). The Mi 2s appeals more to my geek side but I understand it has lower filter life. I have not changed any filter till date, but I clean the filters every 30-40 days religiously. I can run the Philips quietly all night, but the Honeywell, is a bit discernible.
Pre filter is really critical since without it the HEPA filter deals with the Guragon dust, which is simply overwhelming. I wouldn’t recommend any device without it, except the Mi 2s. Their design prevents a pre filter. Else its a perfect device in almost every way except the noise at full speed.