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How Much Electricity Does an Air Purifier Use?

Last updated May 17, 2022

This post may contain affiliate links.

Author avatar Danny Ashton

Danny as been writing about air purifiers for 10+ years. He is a major fan of home technology, which makes him the perfect person to test and evaluate products for HouseFresh

Most air purifiers have an energy usage of between 5 cents and 99 cents a day on their highest mode with 24-hour performance. That’s only a few dollars a week!

We at have made it easy for you to calculate air purifier costs using our online tool:

Simply enter your model’s wattage followed by your cost of electricity by kWh

Room Size
Blueair Pure 411161 sq. ft61W
Smart Air Sqair1100 sq. ft38W
Alen 75i1300 sq. ft45W
Levoit Core 400s403 sq. ft38W
Honeywell HPA300465 sq. ft130W
Coway Airmega 3001256 sq. ft57W
Alen A3501000 sq. ft86.7 W

Something to note is that we found that many air purifiers used far less than the max output wattage when we took direct readings from them to see for ourselves. As an example, if we look at the manual for the Levoit PUR131 we see it is given a Max-rated power of 40W.

Using a power meter we were able to test the PUR131 real-world wattage usage at all different settings.

The amount of wattage varied between modes and never came near to the max stated in the LEVOIT PUR131 manual.

In reality, we experienced the following meter readings for each mode:

Automatic mode (lowest) = 5.4W

One fan = 10.2W

Two fans = 16.4W

Three fans = 24.5W

If we assumed this unit provided 40W it would cost 10 cents a day vs the 6 cents a day that we saw in our own experiments and you are looking at a $10 difference to account for. The additional auto-mode is one of the reasons I am a big fan of the LEVOIT 131 as it only draws 2 cents when in this mode yet is able to move to full speed anytime it detects an allergen/odor.

With energy prices soaring, it’s only natural to think twice before adding another electrical device to your home, but an air purifier is actually really energy-efficient compared to most other household appliances. The benefits they can bring in terms of improving the air quality in your home certainly outweigh any slight increase in your energy bills.

An air purifier can have a significant impact on the air quality inside your home, but is most effective when you are running it 24 hours a day rather than only when you notice a problem with the air (like after cooking a meal in the kitchen). 

This is why it’s understandable that you might have concerns about how much energy a purifier is going to use when it is always on, so the cost is an important consideration when deciding whether or not to buy one – and indeed which model to buy. 

In this article, we’re going to answer the question of how much an air purifier costs to run and help you work out the varying costs of each model with our Cost Calculator, helping you find the right purifier for your home and budget.

Air Purifiers Are Efficient

Unlike other household or office gadgets, air purifiers are efficient by design. They don’t use massive amounts of electricity, unlike a heater, washer/dryer, or refrigerator.

On average, most systems use a maximum of between 40W and 100W, depending on the make and model. Even if you run the air purifier at the highest setting, you’re still talking about 100W or slightly more. 

Most purifiers only need 30W or less for constant performance. It’s best to leave the system running for 24 hours per day, as long as you’re living or working in the building. 

Some only require as little as 10W and that’s comparable to an iPhone charger!

The Design of an Air Purifier

Most electricity goes towards powering the fan. Besides the fan/motor, the only other part of the unit is the filter.

The purifier circulates the air and when doing so, also catches pollutants like pollen, dust mites, and other particles inside the filters. The best air purifier systems depend on the technology of the fan and the quality of the filter. 

Filter Technology

Filters made from fiberglass or mesh perform well and should be replaced regularly, according to the instructions.

Some systems also use ionizing technology to capture negative ions that bond to dust or allergens. This can have some downsides as some older ionizer units were shown to give off too much ozone which can be problematic for some users.

High-Efficiency Particulate Air (HEPA) filters are the industry standard and what we recommend for most issues. These filters can capture most airborne particles, including the coronavirus, using multi-layered netting made of very fine fiberglass threads.Visit WebMD to read more about the benefits of a HEPA filter.


Larger devices can cost more than smaller purifiers but most are able to employ improved design for fan efficiency so their potential extra wattage is more than supported by their superior air cleaning performance. Units with much older technology and design can also use more electricity than necessary and are one of the main reasons we would recommend replacing a 10-year-old air purifier as they often have the same output but with double the power cost.

If you are ever in the market for a new air purifier, we currently recommend first having a look at our list of the top 16 air purifiers for 2021.