Compare air purifiers by delivery and running costs
Commercial disclosure: Specification-based editorial guidance. No hands-on testing, paid placement or affiliate partnership is claimed for this starter content.
Measure the room and consider ceiling height, adjoining spaces and where the unit can stand with clear airflow. A purifier has to suit the space where it will actually operate. Room-size claims can use different assumptions, so do not compare those headlines without reading their methods.
Use a consistent capacity measure
CADR describes clean-air delivery under specified tests. Keep the unit of measurement and particle type consistent when comparing. Actual room conditions, open doors, outdoor air and ongoing pollution sources can change results. A purifier does not establish a medical outcome or remove the need to manage sources of pollution.
Budget beyond the appliance
Find the correct replacement filter and its local availability before buying. Ask about cleaning, replacement guidance, electricity use at your expected setting and service. A cheap appliance with unavailable filters can become an expensive mistake.
Check the setting you will use
A quiet sleep-mode figure is not necessarily the noise level at the highest cleaning speed. Investigate noise and air delivery at the setting you intend to run. Leave sufficient space around the intake and outlet, following the manual.
Compare the records
Inspect the Xiaomi 4 Lite and Philips AC0920/60 with the same checklist. No effectiveness ranking or health promise is implied.
Confirm the exact model, filter part, warranty and current price with the merchant. The catalogue records manufacturer specifications and source links rather than independent air-quality tests.