Do Air Purifiers Cool the Room?

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Written By Jamila W.

As air purifiers have become more popular, a frequent question keeps popping up: “Can air purifiers be used to make the room cold”?

The answer – not really. Most air purifiers do not have the air cooling mechanisms like an air conditioner to create cool air. This is because they are designed primarily for filtration and ventilation.

While at its simplest, many air purifiers are fans with filters attached, they operate much differently from the type of fan you would use to cool a room on a hot day. There are also types of air purifiers that do not require a fan at all!

Read more below for more details on how air purifiers work, why they can’t be counted on to cool a room, and what you can do to cool down a room while using an air purifier.

Airflow directions of an air purifier

How Do Air Purifiers Work

Typically air purifiers will fall into two broad categories:

  1. Models with fans to circulate the air in a closed space through their air filters. Since they do not have an cooling mechanisms, they do influence the temperature inside the room but may produce a slight cooling effect from its effect on air circulation
  2. Air purifiers without fans such as some ionizer models. They also do not affect the temperature of the room

Air Flow Direction

Air purifiers that use a fan can be classified based on the airflow direction:

  • Tower-style models (or forward airflow direction models) like the Dyson Pure Cool draw air from the backside and deliver it towards the front. Although some of these model types have oscillating features and while they won’t cool the air, they also won’t make the room hotterDyson Air Purifiers Pure Cool Front Back Air Inlet Air Purifier Is One of Few Air Purifiers Designed to Also Cool
  • Upward airflow direction (also known as upward air outlet) models draw air from the front, back or sides and then push the air out of the top of the unit. This air circulation process also does not cool a room, and can even make a room warmer by pulling all of the hot air from the ceiling. This type of air movement is known as convection is particularly noticeable when stronger units are used in small roomsIQAir HealthPro Plus Air Purifier Pull Air From The Sides and Bottom and Push Out the Top

Clean Air Delivery Rate

The strength of the airflow generated will be dictated by the CADR of the air purifier you using. The average CFM (cubic feet per minute) of a typical desk fan or ceiling fan will be usually be around 1000+ CFM, because they are focused on moving air over the skin to create a cooling feeling.

Purifiers are more focused on filtering out airborne contaminants, and typically have a CFM of 80-500+. Although technically the air purifier work as a fan, they are far less effective. This is particularly true for units with hybrid air filters, which combine a HEPA filter and activated charcoal filter, giving more purified air but less air flow.

Why Does it Feel like An Air Purifier Made the Room Cooler

While an air purifier’s main job is to filter the air in your home or office, it can potentially create a small breeze based on its type. Many air purifier typically consists of fans with one more filters. Usually the filters will result in less direct air flow.

It is possible for a larger air cleaner to create enough air flow to feel like it rivals a large fan. Air purifiers have a large range of operating speeds, with large units created for larger spaces (like the Medify MA-112) capable of 500+ CFRM.

If used in a small space, this can create the effect of a small breeze. You should not that most air purifiers are not intended to operate at max speed for extended lengths of time, and can often be quite noisy when operating at full output.

How To Cool Down a Room When Using an Air Purifier

Although air purifiers aren’t great for cooling down a room, you have a few options for to use along with them to make a hot day a bit more comfortable. Importantly these methods can be used without taking away from the air cleaning benefits of using an air purifier. The main options:

  1. Air Conditioning: Likely to be the most effective option, especially on hot summer days. Air conditioners and air purifiers can be used together to make your living space more comfortable and healthier
  2. Fans: An oscillating or overhead fan can be used to help circulate air and make a room feel cooler. Although fans do not actually lower the temperature in the room, the breeze they create can help make a warm room more comfortable. Just make sure the room is clean – or else your fan will be blowing around pet dander and dust.
  3. Open a window: Probably a last resort because of the increased strain on your air purifier, you can always open a window. Proper ventilation is crucial for keeping a comfortable indoor environment and opening a window can promote air circulation and prevent stale air from accumulating.


Air purifiers are invaluable tools for improving indoor air quality and giving your family a healthier living space. While they do not cool the room, they increase in comfort your family will receive from breathing clean air should not be underestimated.

By combing air purifiers with strategies like air conditioning, fans, and proper ventilation to make the room colder, you can give your family a pleasant and refreshing environment.

Frequently Asked Questions

Do air purifiers act as fans?

No. While at there simplest air purifiers are fans with one or more filters attached, they are ineffective for cooling a room. The filters they have slow airflow through them. There are also air purifier models (like ionizers and ozone generators) which do not contain fans at all.

Is it OK to sleep in a room with an air purifier?

Yes, sleeping in a room with an air purifier is safe and can be recommended. Research has proven that use of an air purifier can help improve sleep quality even in healthy people. The study found that use of an purifier resulted in longer sleep and higher sleep quality. Air purifiers can also run throughout the night without fear of overheating or releasing harmful particles.

Can you use an air purifier in the summer?

An air purifier can be essential during the summer. During heat spells and high humidity, the use of electricity goes up, accompanied by increased emissions and main pollutants. People also tend to keep the windows shut during the summer months to trap in air conditioned air, which decreases direct airflow in of fresh air.

An air purifier can be used to combat these contributing factors to poor indoor air quality.