An air purifier is a necessary device that assists in getting rid of indoor contaminants like mold and dust. A few individuals are concerned about running the air purifiers the entire day, citing energy usage. That is why individuals wonder how long the air purifier ought to run a day.

Generally, it relies on several things like air circulation, CADR, filters, air displacement, and room size. In general, the majority of air purifiers take half an hour to 2 hours to purify the whole room completely.

You can also run your air purifier for at least some hours with throttle and then return at a lower speed to maintain the indoor air quality. A few brands suggest running their air purifiers for twelve hours every day, while others recommend running them the entire day.

There are several alternatives available out there that can get rid of airborne contaminants including pet dander, dust, smoke, hair, and other dangerous contaminants. But once indoor contaminants are eliminated, running your air purifier can be wasteful, mainly if there’s no change in your indoor air components.


How Long To Run Air Purifier?

What Does The Air Purifier Do?

The air purifier makes use of advanced air cleaning technology and filters for cleaning the indoor air. It assists in removing pollutants such as bacteria, allergens, toxins, dust, and smells so that you can breathe simply. Getting rid of particles mainly relies on the filter you utilize on the air purifier.

The majority of AC-powered air purifiers utilize a set of filters and a fan for capturing dust mites, while others remove airborne particles without filtering. Besides, you’ll locate Battery Operated Air Purifiers that utilizes advanced technology to destroy pathogens and germs that are dangerous to the health.

Is It Safe To Run An Air Purifier All The Time?

Yes. Air purifiers are usually created to be run all the time if you want to. You can put your purifier at the lowest setting to reduce noise and allow it to run all day. This 24/7 approach will utilize a little more power, and you might have to replace or clean air filters more frequently. Today’s smart purifiers are great at informing you when it is time to change the filters.

Should I Sleep With The Air Purifier On?

Certainly, if you want, you can sleep with your air purifier on with no issues. The air purifiers do not cause issues as they simply get rid of particles from the air; they do not append anything to it. Moreover, leaving them on throughout the night is a great way to ensure the air is kept clean constantly.

However, if you are a light sleeper, you might desire to contemplate a model with the sleep mode function. As a few air purifiers can be a bit noisy, the sleep mode feature is an ultra-quiet mode that keeps your purifier running but with an extremely low speed that is almost impossible to hear. A few models also dim the control panel lights as well.

Should I Run My Air Purifier All Day?

No, air purifiers do not have to be running all the time; a few machines require to be running for three to four hours while others run for just an hour or whenever the indoor contamination levels spike. Running the air purifiers unnecessarily can add to the electricity bills if the purifier lacks air quality sensors.

There are diverse types of air purifiers that have to be run in a diverse manner, so if you think if the air purifier has to be run for the entire day or for some hours, you are in the correct spot. This article will assist you in understanding how long you have to run the air cleaner and what difference in the air quality you can actually expect from it.

Clean Air Delivery Rate (CADR) And Air Changes Per Hour (ACH):

To decide whether you have to run the cleaner for long periods or for some hours, we have to comprehend the ACH and CADR of a purifier. A higher CADR rating denotes the air cleaner is driving out more cubic feet per minute of the clean air.

CADR is frequently calculated in cfm (cubic feet per minute) and are stated on the majority of air purifier home appliances. A few air purifier brands wrongfully overplay air purifier specs by mentioning a higher coverage area. The purifier fails when tested, and the air doesn’t feel clean. That’s because the purifier is just changing the air in that room once an hour.

Air Changes Per Hour (ACH) refers to the number of times the air indoors is cycled using the air purifier in one hour. The higher the ACH, the better the level of air quality as the air purifying system gets rid of almost all contaminant particles as air is cycled several times using the purifier.

Purifiers with a higher Clean Air Delivery Rate frequently have a higher Air Changes Per Hour but can also bring high electricity use; however, the additional usage is justified as such high-end air purifiers can defeat asthma symptoms in minutes. It assists asthma sufferers in breathing in healthy, safe air. Such purifiers just have to be run for some minutes or one hour at most to remove common allergens.

Brand Recommendations:

The majority of brands recommend that for making an obvious change in the air quality, the air purifier has to be run for four hours a day at least. But this number can differ a lot based on the pollution levels, the season, and the type of filters.

The rule of thumb is actually to run the air cleaner for at least twelve hours. However, for the smaller purifiers with low ACH and CADR ratings, it’s better to keep your air purifier running the entire day for the best result.

A perfect air purifier quietly and quickly removes pollutants, comprising smoke, dust, and pollen. But pollutants and airborne particles keep circulating the entire day continuously if the outdoor air is contaminated.

If the office or house is an overly polluted space, keep your air purifier on for the entire night and day. When specialists are asked about how long an air purifier should run, they frequently recommend running cleaners continuously and at full speed.

How Frequently Should You Run The Air Purifier?

Every time there’s a change in the quality of indoor air, the air purifier ought to be utilized. For asthma patients and allergy sufferers, it’s advised to utilize the air purifier whenever they enter the house to ensure a clean supply of fresh air.

If the surroundings have a high amount of pollutants including dust, pollen, and smells, then you may desire to run the air purifier round the clock for the best outcomes. For spaces such as a dressing room or the bathroom, you can run the air purifier just while you are present there.

The majority of high-end purifiers recently come with air quality sensors that automatically regulate the energy consumption and fan speed according to the ambient air quality, so you do not need to tweak with intricate controls each time you desire to turn up the purification.

Can I Set The Timer For The Air Purifier?

Yes, a lot of today’s air purifiers let you set timers to switch on and off at certain times of the day. That can save much time when you’re planning on when to utilize the purifier. In a lot of situations, you can set it to run when you are gone and come back home to cleaner air.

How Long Does The Air Purifier Really Take For Cleaning The Room?

Relying on the coverage area and CADR a purifier is rated for, the air purifier can take under thirty minutes to purify the indoor air. Longer runs will let it completely get rid of possible allergens, pollutants, and particles from the air. However, cleansing your indoor air isn’t an easy thing as it relies upon different factors. Such comprise:

  • Area of the room
  • Weather conditions
  • Model of an air purifier
  • Speed of air purifier
  • CADR
  • Location of the room
  • Type of activities performed in that room

Room Usage:

A room used for powder involving actions, painting, sculpturing, artwork, and other such activities is likely to have more pollutants compared to PC rooms. Thus, the activities done in the space also change the time the cleaner will take to clean it.

Room Location:

The room’s location affects the time the air purifier actually takes to clean the space. A cabin situated in a dirty place, exposed to external things through several windows, is likely to have more airborne pollutants. But a space that has zero access to fresh air or has limited aeration will be less dirty. The dustier a space, the more time your air purifier will take to clean it. It’ll change how long you run your air purifier.

Fan Speed:

Air purifier speed plays a very important role in determining the time for cleaning. The best way to clean the room using the air purifier is to run it at the optimal speed for the initial 1-2 hours, and later, decrease the speed to slow or medium.

Floor Area:

The bigger space is, the more time the air purifier will take to purify it. Medium and small-sized spaces need less time to clean as compared to the bigger closed rooms. On average, the air purifier can take from thirty minutes to 2 hours to clean the air in a closed space.

Air Purifier Type And Model:

The airflow capacity and model of the air cleaner also impact how long you ought to run the air purifier; the air cleaner with appropriate airflow capacity for fulfilling the space is the best option to clean that room. The extraction rate also influences the duration the air cleaner takes to clean. It’s because the extraction rate decides how much air is purify-able in an hour. A HEPA air purifier working at four air changes for each hour will take half the time to purify the air of space compared to the air cleaner running at two air changes for each hour. Weather Conditions:

It also impacts how long to run your air purifier. During the summer season, the amount of pollen in the air is high, and during the dust storm warning, dust particles in the air are very high. Under these conditions, the air cleaner takes more time to clean.

Contemplating all factors, the average time a perfect air purifier takes to purify the air is within the range of thirty minutes and two hours. Once the air cleaner is on 20 minutes later, you’ll likely experience a significant change in the air.

Do Smart Air Purifiers Know When The Air Is Clean?

A lot of air purifiers do. A few of the top smart air purifiers observe air quality and show quality readings either on your purifier itself or using the connected application. That permits for much closer monitoring, and you can check how the air purifier really affects the quality of air and get hard numbers on how long actually to run the purifier in the specific space.


The air purifiers are exceptional at bringing down airborne pollutants and particulate matter in the air but too much usage can considerably impact the filter life and can also diminish the lifespan of the purifier. Air purifiers rated for entire-day use are created differently and can endure prolonged usage. This article will assist you in comprehending the purifier better and will assist you in running it in the most favorable manner.