how much electricity does air purifier use

How Much Electricity Does An Air Purifier Use?

Ian Mutuli
Updated on
Ian Mutuli

Ian Mutuli

Founder and Managing Editor of Archute. He is also a graduate architect from The University of Nairobi, Kenya.
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In recent years, indoor air quality has gained significant attention. As a result, air purifiers have become popular devices for improving the air we breathe indoors. However, concerns about their energy consumption have also emerged, raising questions such as ” how much electricity does an air purifier use?”

Understanding the electricity usage of air purifiers is crucial for environmentally conscious consumers and those looking to minimize their energy costs. Our article delves into the factors influencing an air purifier’s electricity consumption and provides insights into its energy efficiency.

What Is An Air Purifier?

An air purifier is a device that enhances indoor air quality by eliminating pollutants and contaminants. It pulls in surrounding air, passing it through filters or purification mechanisms before releasing clean air back into the room. The most widely used filter is the High-Efficiency Particulate Air (HEPA) filter, which can efficiently remove particles as tiny as 0.3 microns.

HEPA filters capture allergens and fine particles, making them highly effective in improving air quality. Air purifiers are beneficial for improving air quality in homes, offices, and schools, especially for those with allergies or respiratory conditions, creating a healthier indoor environment.

What is an air purifier

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Factors Affecting Air Purifiers’ Energy Consumption

1. Purifier Type and Size

Different types and sizes of air purifiers have varying energy consumption levels. Generally, larger air purifiers with powerful motors consume more electricity than smaller units. High-performance models with additional features like multiple fan speeds, automatic sensors, or UV sterilization may consume more energy due to enhanced functionality.

2. Filter Type and Maintenance

Air purifiers use filter technologies, such as HEPA (High-Efficiency Particulate Air), activated carbon, or electrostatic filters. The filter type and quality affect the air purifier’s energy usage. HEPA filters, for instance, can be more energy-intensive due to their dense construction and the need for stronger airflow to maintain effective filtration.

Filter Type and Maintenance

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Regular filter maintenance is essential to ensure optimal performance and energy efficiency. Clogged filters can restrict airflow, making the air purifier work harder and consume more electricity. Therefore, following the manufacturer’s filter replacement or cleaning guidelines minimizes energy consumption.

3. Fan Speed and Usage Patterns

Air purifiers generally offer multiple fan speed settings to adjust the airflow according to the room’s air quality. Higher fan speeds provide faster purification but consume more energy. The duration and frequency of air purifier usage also impact energy consumption. Constantly running the device at high speed will result in higher electricity usage than intermittent or low-speed usage.

How To Evaluate Energy Efficiency In Air Purifiers

1. Energy Star Certification

The Energy Star program, a voluntary labeling initiative by the U.S. Environmental Protection Agency (EPA), identifies energy-efficient products. Energy Star-certified air purifiers have been tested and meet specific energy efficiency requirements. Choosing an Energy Star-certified air purifier can ensure lower energy consumption without compromising performance.

2. Power Consumption Ratings 

Manufacturers often provide air purifier power consumption ratings in watts (W) for air purifiers. These ratings indicate the maximum power the device will draw under normal operating conditions. Comparing power consumption ratings can help consumers decide when to select an energy-efficient air purifier.

3. Energy-Saving Features

The best air purifiers and dehumidifiers incorporate energy-saving features, such as programmable timers or automatic sensors. These features enable users to schedule operating times or adjust fan speed based on air quality, reducing energy consumption when purification is unnecessary. Considering air purifiers with such features can contribute to an overall low electricity bill.

How Much Electricity Does Air Purifier Use

1. Determining Energy Consumption

The amount of electricity an air purifier consumes depends on various factors, such as the specific model, its power rating, and the settings you choose to operate it at. However, in general, air purifiers are designed to be energy-efficient appliances. Air purifiers typically have wattage ratings ranging from 10 watts to 100 watts.

Some high-performance models may consume more power, but most fall within this range’s lower end.

Determining Energy Consumption


To determine an air purifier’s power consumption, you can multiply its wattage rating by daily operating hours. For example, if you have an air purifier with a power rating of 50 watts and you run it for 8 hours a day, the daily energy consumption would be:

50 watts * 8 hours = 400 watt-hours (or 0.4 kilowatt-hours)

To estimate monthly or annual energy usage, multiply this daily consumption by the number of days or months of operation.

It’s worth noting that some air purifiers come with multiple fan speeds or additional features like ionizers or UV lights, which may consume more energy when activated. Running an air purifier on higher fan speeds or using additional features can increase electricity usage.

2. Calculating Electricity Costs

To determine the electricity cost, multiply the energy consumption (kWh) by the local electricity rate. For instance, if the rate is $0.15 per kWh, the daily cost for the above example would be $0.06 (0.4 kWh x $0.15/kWh).

Tips For Energy-Efficient Air Purifier Use

1. Choose an Energy-Efficient Model

When selecting an air purifier, consider the Energy Star certification. Energy Star is a program that identifies and promotes energy-efficient products. Air purifiers with this certification are designed to meet strict energy efficiency guidelines, ensuring they consume less electricity than non-certified models. Choosing an energy-efficient unit can save on energy costs in the long run.

2. Select the Right Size for Your Space

Air purifiers are designed to clean the air in specific room sizes. Purchasing a unit that is too large for your space will result in unnecessary energy consumption. On the other hand, using a small air purifier in a large room may lead to inadequate air cleaning. Refer to the manufacturer’s guidelines or specifications and choose an appropriately sized purifier for the room you intend to use it in. This way, the purifier can operate optimally without wasting energy.

3. Place the Air Purifier Strategically

The placement of your air purifier can impact its effectiveness and energy efficiency. Position it in an area that allows proper airflow and circulation. Avoid placing the unit too close to walls, furniture, or curtains, as it can obstruct the intake or output vents, reducing efficiency. Ensure sufficient space around the air purifier promotes optimal air movement and filtration.

4. Use the Lowest Fan Speed Setting

Use the Lowest Fan Speed Setting

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Most air purifiers have adjustable fan speed settings. Higher fan speeds generally result in better air circulation and faster filtration. However, they also consume more energy. Unless there are concerns about air quality, such as odors or allergens, try using the lowest fan speed setting that still provides adequate filtration. This way, you can reduce energy consumption while maintaining reasonably clean air.

5. Utilize Timer and Scheduling Features

Many air purifiers have built-in timers or scheduling features. Take advantage of these functions to customize the operating hours of your air purifier. For example, if you know that air quality is typically worse during specific times of the day, you can schedule the purifier to operate during those periods.

Similarly, if you spend most of your time in certain rooms, you can set the purifier to turn on only when you are present. You can minimize unnecessary operations and conserve energy using timers and scheduling features.

6. Maintain Regular Filter Maintenance

Filters are essential for air purifiers as they trap and remove airborne particles. Over time, filters accumulate dust, pollutants, and contaminants, which can reduce the air purifier’s efficiency. When the filters are dirty, the purifier needs to work harder to pull air through, leading to increased energy consumption.

Ensure you purchase the best air purifiers with washable filters and follow the manufacturer’s recommendations for filter maintenance, including cleaning or replacing them regularly. Keeping the filters clean and well-maintained ensures optimal performance and energy efficiency.

7. Open Windows When Air Quality Is Good

While the purpose of an air purifier is to clean indoor air, there may be times when the outdoor air quality is better than the indoor air quality. Consider opening windows and allowing natural ventilation to improve indoor air quality in such situations. This can reduce the workload on the air purifier, allowing it to operate at lower settings or even be turned off temporarily, thereby saving energy.

However, be cautious of outdoor pollutants or allergens that may enter through the open windows and affect air quality.

8. Consider Overall HVAC System Efficiency

The efficiency of your heating, ventilation, and air conditioning (HVAC) system can impact the need for an air purifier. If your HVAC system already includes air filtration components, such as high-quality filters or a dedicated system, it may effectively clean the indoor air. In such cases, the reliance on an air purifier can be reduced, leading to energy savings. Regularly clean or replace the filters in your HVAC system to ensure efficient air filtration.


While air purifiers are efficient in cleaning indoor air, understanding their energy consumption is essential for environmentally-conscious consumers and cost-conscious individuals. Factors such as purifier type and size, filter quality, fan speed, and usage patterns affect an air purifier’s electricity consumption. Energy Star certification, power consumption ratings, and energy-saving features provide valuable insights into the device’s energy efficiency.

Users can make informed decisions and manage their electricity expenses by estimating energy usage and costs or using energy-efficient air purifiers. Adopting efficient air purifier usage tips, such as right-sizing the device and optimizing fan speed and maintenance practices, can enhance energy savings. Striking a balance between clean air and energy efficiency allows individuals to create a healthier indoor environment while minimizing their ecological footprint and electricity bills.

Ian Mutuli

About the author

Ian Mutuli

Founder and Managing Editor of Archute. He is also a graduate architect from The University of Nairobi, Kenya.
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