Should an air purifier stay on day and night, or is occasional use enough? The short answer: for the best results, an air purifier should ideally run continuously, but that doesn't mean it needs to be on full power all the time.
Why continuous use yields the best results
Air in the home is constantly in motion. As soon as you open a door, cook, stir up dust, or someone walks inside, new particles enter the room. An air purifier works best as a type of filter that runs continuously, similar to how an aquarium filter constantly purifies water instead of just running once a day. As soon as you turn the device off, fine dust, pollen, and other particles can begin to accumulate again. Many people notice that the air quality feels noticeably more stable when the air purifier runs all day, rather than just switching it on briefly from time to time.
On full power or a low setting?
Leaving it on day and night doesn't have to mean the device is running at its highest speed continuously. Most air purifiers, including the AirPure Plus PA244, have multiple settings. A practical approach is: switch to high when you first get home, after cooking, or after vacuuming, and then switch back to a low or automatic setting to maintain the air quality achieved. This is more energy-efficient and usually quieter as well.
What about electricity costs
An air purifier on a low setting typically uses no more than a few watts, comparable to a router or a phone charger. Even at the highest setting, for example 45 watts with the AirPure Plus PA244, 24 hours of continuous use costs about the same in electricity as an average LED light bulb left on all day. For most households, this is a negligible addition to the energy bill, especially in relation to the comfort of cleaner air.
When turning it off is wise
There are a few situations where it is perfectly fine to switch the device off. If you are away for an extended period, running it continuously makes little sense because there is no one there to benefit from the clean air. You should also, of course, turn off the device during maintenance, such as cleaning or replacing the filter. Otherwise, there is no reason to turn off an air purifier after every use: it is designed to last a long time with prolonged use.
Filters and wear
Continuous use does mean that the filter will fill up faster than with occasional use. Therefore, keep an eye on the recommended replacement schedule and regularly check if the filter still looks clean. A saturated filter does not clean as effectively and can cause the device to work harder than necessary.
Our advice
Our experience is that an air purifier is most effective when left on all day at a low or automatic setting, with an occasional higher setting during extra pollution such as cooking or cleaning. With its night mode and three speed settings, the AirPure Plus PA244 is well-suited for this type of continuous use, without you having to worry about high electricity bills. Keep the filter in good condition with a timely replacement using the HEPA 13 replacement filter.