Can You Leave An Air Purifier On All Night? (Good Or Bad?)

  • Author: Irene Batres
  • Date: February 17, 2023
  • Time to read: 7 min.
Affiliate Disclaimer

As an Amazon Associate, we earn from qualifying purchases.

Are you worried about whether using an air purifier all night is safe and effective?

Air purifiers are all the rage in homes across the globe nowadays, but some folks are uncertain if it’s okay to keep them on all night.

Due to the increasing air pollution and allergens, it’s essential always to have clean air, right?

So, In this post, I will answer the question, “Can You Leave An Air Purifier On All Night?”

You’ll also discover the advantages and potential risks of using an air purifier all night and valuable tips for safe and efficient use.

Can You Leave An Air Purifier On All Night?

Key Takeaways:

  • You can leave an air purifier on all night, and it is even recommended as the air cleaners are designed to work continuously, giving better results than just running the device for a few hours.
  • Air purifiers are effective in eliminating odors and relieving allergies, and they are excellent in homes with smokers.
  • It is generally safe to leave an air purifier on all day and night as it has been manufactured with continuous use in mind, but the filters must be replaced more frequently.
  • Running an air purifier always has many benefits, such as getting a better night’s sleep, breathing more freely, constantly having bacteria-free air, eliminating odors, and removing VOCs and outside fumes.

Can You Leave An Air Purifier On All Night?

Yes, you can leave an air purifier on all night. In fact, leaving it running 24/7 will give you far better results than merely running the device for a few hours. 

These air cleaners are designed to work continuously, and the more they are allowed to do so, the cleaner the air will be. 

An air purifier is a great way to eliminate odors and relieve allergies.

They are also great in homes with smokers since these devices can quickly eliminate smoke and smell.

You may be surprised to learn the benefits of letting your air purifier work overnight. 

h2 class="wp-block-heading">How Many Hours A Day Should You Run An Air Purifier?
Is It Ok To Leave An Air Purifier On All Night?

Most air purifier experts will tell you that running your device 24 hours daily will provide you with the cleanest air.

However, this doesn’t mean you should run the machine on the highest setting for the entire time. 

It would be best if you run the air purifier on a high setting for a couple of hours to get the best results.

This will remove most of the airborne particles and clear the room. If you have a larger space, you may wish to increase this time.

After running it at full speed for two hours, you can return the settings to the lowest option.

That said, this will help maintain the level of clean air in the room throughout the rest of the day.

class="wp-block-heading">Is It Safe To Leave An Air Purifier On All Day And Night?

Many electrical devices that serve an ongoing purpose have been designed with continual use in mind.

For example, consider your fridge or freezer, which remains plugged in and running 24/7.

Your air purifier is no different.

As a matter of fact, it has been manufactured in such a way that continuous use won’t cause any safety hazards.

However, it is worth remembering that running the air purifier all day and night will mean the filters must be replaced more frequently.

Benefits Of Leaving An Air Purifier Running All The Time

Air Purifier Overnight

You will likely appreciate running an air purifier all the time.



Because it is the best way to tackle air problems within the home, let’s look at the benefits of running the device continuously.

  • You will get a better night’s sleep thanks to the ability to breathe more freely – this is especially important for those with allergies, asthma, and other breathing conditions.
  • The air in your home will constantly be free from bacteria, so you and your family will remain healthier. 
    • It’s no secret that humans can create some questionable odors, but running your air purifier all the time can eliminate these odors, leaving your home fresher and more pleasant.
    • Some building materials contain harmful chemicals, and these can be passed into the air and, as such, breathed in by you and your family. Your air purifier will ensure that VOCs are effectively removed. Inhaling these particles could potentially play a part in developing lung cancer.
    • Outside fumes can easily penetrate the home if you live in a significantly polluted urban location. Running an air purifier daily at night will remove these fumes from your home.

    Disadvantages Of Leaving An Air Purifier On 24/7

    While there are many reasons why continually using your air purifier is excellent, there are a few downsides.


    it is worth remembering that the advantages far outweigh the disadvantages. 

    • The filter must be replaced frequently. If not, dust and dirt will build up, making the air purifier far less effective.
    • If you are running an ozone air purifier, this could potentially do more harm than good.

    Do Air Purifiers Help With Sleep While Running Overnight?

    Air purifiers are great for helping you obtain better quality sleep, and there are many reasons for this.

    Primarily those with lung conditions and allergies. And even sleep apnea will likely find relief from their conditions when using an air purifier overnight.

    Often, a

    llergens will settle during the night, increasing your body’s reaction to them.

    Think about how bad your hay fever gets on those summer evenings.

    Running your air purifier through the night will remove these allergens, leaving you free to sleep peacefully.


    ly, many air purifiers on the market emit a low hum, and this white noise can help people drift off to sleep more easily.

    Studies have shown that white noise has a positive impact on sleep quality.

    So even if you don’t suffer from breathing difficulties, the gentle sound could be beneficial.

    What’s more,

    some air purifiers out there can cool down a room. And can act as a temperature control system, like the Dyson Hot + Cold.

    For example, sleep is much more easily induced when you are in a comfortable environment. 

    Summary – Is It Ok To Leave An Air Purifier On All Night?

    You can leave your air purifier running all night, and it will not do any harm.

    If anything, t

    his is the preferred mode of operation as you can maintain continually clean air throughout the home.

    This can aid with sleep and help those struggling with allergies.

    However, it would be best to remember that doing this may require more frequent filter changes and will use slightly more power.

    I hope this ar

    ticle was helpful. You can find other helpful information about air purifiers in our blog section.

    Air Purifier Overnight FAQ

    Are There Any Times You Shouldn’t Run Your Air Purifier?

    There are a few scenarios when running your air purifier is not advisable.

    For instance, if you happen to use an ozone air purifier, it’s best to avoid running it while you’re in the room. The reason is that ozone air purifiers produce harmful byproducts that can threaten your health.

    -heading">Should I Leave My Air Purifier On When I’m Not Home?

    You can keep your air purifier running even when you’re not home; this is a common practice among experts.

    Keeping your air purifier running can help to maintain clean and fresh air indoors by removing allergens, dust, and other harmful particles.

    Leaving it on all the time is a recommended approach for those who value a healthy indoor environment. Of course, if you plan on being away for an extended period, you can turn it off to save energy and extend the filter’s life. Once you’re back, turn it back on to resume air purification.

    eading">Will Leaving An Air Purifier On All Night Increase My Energy Bill?

    An air purification system generally consumes around 40-100 watts of energy hourly, which can vary based on the rate of air circulation.

    Therefore, keeping the purifier switched on throughout the day and night would add an estimated $3-10 to the monthly electricity expenses.

    Is It Good To Sleep With An Air Purifier

    Yes, it is recommended to use an air purifier while sleeping. Air purifiers efficiently eliminate allergens from the air, which, in turn, can enhance sleep quality by reducing odors and promoting better breathing patterns.

    A recent clinical

    research study carried out in 2019 demonstrated that air purifiers could remarkably enhance overall sleep quality. (1.)

    Looking For Air Purifier Guides?

    If you’re looking for more air purifier resources, consider checking out our other posts on air purifiers.">Best Air Purifiers For Ferret Odor
  • Best Hepa Air Purifiers For Asbestos
  • Best air purifier for cat litter dust
  • >
    irene mills author of freshairdevices


    Irene Batres is eager t

    o help others create an indoor allergen-free home. She has years of experience testing out air purifiers, dehumidifiers, and other products designed to help with indoor air quality. Learn more about me.