If you've been running your air purifier frequently and have started to worry it might be costing you a lot of money, you can put those worries to bed. It costs much less than most people expect.
Most home air purifiers use somewhere between 5 and 100 watts, putting them in the same range as a light bulb.
We've got a full breakdown of what it actually costs to run an air purifier and a couple easy ways to keep your purifier's energy use low.
How Much Electricity Does an Air Purifier Use?
The majority of typical home air purifiers draw between 5 and 100 watts (W) of power, but this depends on the purifier model and the running fan speed.
A good chunk of the time, you won't run the purifier at max speed, and you'll likely have it set to auto mode or sleep mode (if available) overnight. Having it on these adaptive settings or on lower speeds will use less energy, so your usage will fall well below the upper end of that 5–100W range.
Here are some examples based on the rated powers of our Dreame Air Purifiers:
- FP10 = 45W max.
- AP10 = 68W max.
- PM10 and PM20 = 33W in fan and cooling mode. Running at their highest fan speed continuously uses less than 1 kWh per day.
All of those are top-end figures. At lower speeds, the draw is noticeably less.
You can compare this to a standard incandescent light bulb, which draws around 60 watts. Running a mid-range air purifier all day is roughly the same as leaving one of these bulbs on, or even sometimes less.
How is Electricity Measured?
Your utility provider charges you in kilowatt-hours (kWh), not watts. A watt is the rate of power use, and a kWh is how much energy is used over time.
This is how you can work out how much kWh something uses, according to the U.S. Department of Energy:
- Watts ÷ 1,000 × hours used = kWh
As an example: if you run the Dreame FP10 Air Purifier at its 45W maximum for a full 24 hours, it uses 1.08 kWh (45 ÷ 1,000 × 24 = 1.08 kWh). That's almost the same as leaving a ceiling fan on all day.
How Much Does It Cost to Run an Air Purifier?
The rolling 12-month average residential electricity rate in the U.S. sits at around $0.17 per kWh. But rates can also range by state, such as from around $0.12/kWh in North Dakota and Louisiana to $0.43/kWh in Hawaii.
This table shows you what 24/7 operation at maximum power works out as when using Dreame Air Purifiers, plus a higher-wattage comparison:
|
Wattage |
Air Purifier Model |
Daily Cost |
Monthly Cost |
Annual Cost |
|
33W |
Dreame PM10 & PM20 (fan mode, max) |
~$0.13 |
~$4.00 |
~$49 |
|
45W |
Dreame FP10 (max.) |
~$0.18 |
~$5.50 |
~$67 |
|
68W |
Dreame AP10 (max.) |
~$0.28 |
~$8.30 |
~$101 |
|
100W |
Large unit at full speed |
~$0.41 |
~$12.25 |
~$149 |
These figures are based on a rate of $0.17 per kWh at maximum W. When you're using auto or sleep mode, the purifiers will draw a lot less, so real-world monthly costs are typically lower than the numbers above in the table.
How Air Purifier Energy Consumption Compares to Other Household Appliances
When you're trying to understand the cost of running an air purifier, it's quite helpful to see how it compares to other devices running in your home.
According to the U.S. Department of Energy's appliance energy estimator, this is how much power some common household appliances use:
|
Appliance |
Typical Wattage |
|
Air purifier (sleep/quiet mode) |
5–20W |
|
Air purifier (mid-range, max speed) |
45–100+W |
|
Laptop |
25W |
|
Ceiling fan |
35W |
|
Refrigerator |
225W |
|
Microwave oven |
1500W |
|
Clothes dryer |
2790W |
You can see here that running an air purifier at max speed all day (45–100+W) uses much less power than a single dryer cycle (2790W). Further to that, compared to central AC (which the U.S. Energy Information Administration notes accounts for approximately 19% of average household electricity use), the difference is huge.
What Affects Air Purifier Energy Usage?
A few things determine how much power your purifier actually uses day-to-day, and getting an understanding of them will help you keep costs low without compromising on clean air.
Room Size and Unit Capacity
A purifier that's made to cover a space of1,800 ft² (167 m²) needs a stronger motor than a purifier for a single bedroom. If you use an undersized purifier unit at max power to compensate for a too-large space, it's both less effective and less efficient.
You need to match the right purifier to your room size so that air quality and energy use are at their peak.
Fan Speed
Fan speed is a big factor here for energy use. A purifier drawing 60W at full speed might use only 15–20W on its quiet setting.
Multi-function features affect consumption, as well.
The AirPursue™ PM20 Purifier's heating function, for example, uses approximately 1.5 kWh per hour of active heating, versus its 33W fan-only operating power. If you use heating regularly, that's worth factoring into your running cost expectations.
Continuous vs. Intermittent Use
Many people will have the instinct to switch their purifier off when leaving the house, but did you know that running it continuously at a lower speed is often more efficient overall?
Short, high-power bursts use more energy than steady low-speed operation, and they give pollutants a chance to build up while the unit is off, which we want to avoid.
Filter Condition
A clogged filter is a bit like a blocked straw — the motor has to work harder to move the same volume of air through it. The motor's extra effort means a higher energy draw (and often with worse air quality to show for it).
Keeping on top of maintenance means more effective air filtration and also more efficient running.
Smart and Auto Modes
Purifiers with real-time air quality sensors respond to pollutants actually in the air and adjust accordingly, rather than running at a fixed speed regardless of conditions.
Over a full day, that responsiveness can make a meaningful difference to how many kWh the unit consumes. It's much better than leaving the system on full power all day and night.
Why Air Purifiers Are Designed to Run Continuously
Indoor air doesn't stay clean for good once it's been filtered. Every day home activities like cooking, cleaning, playing with pets, and opening your windows introduce new particles.
Running a purifier continuously (even at a low setting) keeps indoor particle levels steadier throughout the day, rather than letting them build up and settle.
If you have young children, allergies, or pets in your home, having consistently clean air is worth more than the few cents you'd save by switching it off, as you're promoting the health of your home.
The design of modern air purifiers reflects this by incorporating low-wattage motors, smart auto modes, and efficient airflow designs to support long, quiet, low-energy runs, so you can improve the quality of your home's air.
6 Tips to Reduce Air Purifier Electricity Costs
-
Use auto mode. Let the purifier's sensors set the fan speed. It only works harder when it needs to, which keeps average energy use low without any effort from you.
-
Match the unit to the room. An oversized unit wastes energy, and an undersized one compensates by running at max. Our guide on how to choose an air purifier for your home walks through the key things to look for.
-
Stay on top of filter maintenance. A restricted filter makes the motor work harder, so make sure to change the filters as recommended by the manufacturer's guidelines.
-
Lower the fan speed in cleaner spaces. Save the higher settings for kitchens, pet areas, or those moments when you've burned dinner, and the whole house knows about it.
-
Use sleep or quiet mode at night. Most purifiers drop to their lowest fan speed in this mode while still filtering continuously. Cleaner air while you sleep, without the noise or the added cost.
- Avoid switching it off and on repeatedly. A purifier running quietly on a low setting all day uses less energy overall than one that's constantly restarted.
Frequently Asked Questions
How Much Does It Cost to Run an Air Purifier 24/7?
At the U.S. average rate of around $0.17 per kWh, our PM10 and PM20 Purifiers at their 33W cost roughly $4 per month to run continuously. Rates vary across states, so it's worth checking your electricity bill for your exact rate.
Do Air Purifiers Increase Your Electricity Bill Significantly?
For most households, no. The monthly cost is usually between $2 and $9, but this depends on the model you have and how hard it runs. That cost is roughly comparable to leaving a few LED lights on around the house. Higher-wattage units at full speed cost a bit more, but even those remain modest compared to major home appliances, like washers.
Should I Turn Off My Air Purifier at Night to Save Energy?
No, keep it on in sleep or quiet mode. It uses minimal power, and turning it off means breathing unfiltered air for hours. If you’re worried about energy use, lower the fan speed instead of switching it off.
Enjoy Cleaner Air Without Driving Up Energy Costs
Air purifiers are among the most efficient appliances. At typical wattages, monthly costs are usually well below $10, and often even lower when using auto mode or lower fan settings.
The reality is simple: cleaner air, less dust and pet dander, and fewer allergens, all for around about the cost of one cup of coffee each week. With the right unit and a few smart habits, the energy impact is minimal.
Explore our full range of Dreame Air Purifiers to find the right fit for your home.
References:
- U.S. Department of Energy — Estimating Appliance and Home Electronic Energy Use. https://www.energy.gov/energysaver/estimating-appliance-and-home-electronic-energy-use
- U.S. Energy Information Administration — Table 5.3: Average Price of Electricity to Ultimate Customers, Electric Power Monthly. https://www.eia.gov/electricity/monthly/epm_table_grapher.php?t=table_5_03
- U.S. Energy Information Administration — 2024 Average Retail Price of Electricity by State (Table 4). https://www.eia.gov/electricity/sales_revenue_price/pdf/table_4.pdf
- Dreame Support — Is the Dreame Air Purifier energy efficient? How much electricity does it consume?
- https://support.dreametech.com/hc/en-us/articles/13200018967311-Is-the-Dreame-Air-Purifier-energy-efficient-How-much-electricity-does-it-consume
- U.S. Energy Information Administration — Electricity Use in Homes. https://www.eia.gov/energyexplained/use-of-energy/electricity-use-in-homes.php