Questions about Philips AC4221/11

As far as I know, the AC4221/11 appliance is the successor model to the AC4236/10 appliance. The AC4236/10 model has been sold in Switzerland since January 2020, the AC4221/11 model since January 2025. The cleaning performance of the newer model is said to be slightly better, but the filters, which have to be changed annually, are more expensive than those of the predecessor model. https://www.heise.de/bestenlisten/ratgeber/top-luftreiniger-im-ausverkauf-philips-ac423610-fuer-250-euro/j0xp033 See also toppreise.ch: There you can check how long a product has been available.

Unfortunately, we do not have the right filters in our range.

Yes, the model can be controlled via the app. The Philips Air+ app allows you to create schedules and set different operating modes.

The air purifier does not have a specific nitrogen dioxide (NO2) sensor. However, it uses a double layer of activated carbon that can reduce nitrogen dioxide. The automatic mode reacts quickly to detected pollutants, as the sensors analyse the air quality 1,000 times per second and adjust the purification stages accordingly.