Of the many appliances in the average home that require electricity, air purifiers are not the most energy-intensive by any means. Washing machines, dishwashers, refrigerators and air conditioners all use significantly more electricity than air purifiers, and even smaller appliances like toasters and coffee makers are much more energy intensive. That being said, you probably aren’t running your toaster 24 hours a day!
Find out how to calculate exactly how much electricity your air purifier uses, what factors affect its energy consumption and how to optimize its efficiency in this article!
Air purifiers generally use a fan to pull in contaminated air, send it through some kind of filtration or purification (mechanical or chemical filters or a UV air purification system), and push cleaned air back into the room.
The air purifier’s fan tends to be the main source of energy consumption. Air purifiers that use a UV disinfection process also require electricity to generate light, but the energy consumption is usually minimal.
The square footage the air purifier covers
There are air purifiers available for a vast range of spaces, from small one-room devices that cover just a few hundred square feet to powerful whole-house air purifiers that cover 4,000 sq. ft. or more.
Of course, the larger the space, the higher the volume of air to be cleaned. A higher volume of air will require a more powerful fan to achieve an acceptable clean air delivery rate (CADR), and a more powerful fan will use more electricity.
How many hours the air purifier runs per day
For optimal air cleaning, it’s best to leave your air purifier on all day every day. They are designed for constant use and only consume a little bit of energy at a time. However, those who are concerned about the electricity cost of a constantly running device may choose to turn it off while they’re at work, or only run it while they’re asleep.
The setting used
Air purifiers generally have more than one setting. The power consumption rate provided by the manufacturer is usually based on the highest setting, so you can save energy by running your air purifier at a lower setting.
It’s best to use the highest setting when first turning on the air purifier to efficiently clean the air, but it’s fine to switch to a lower setting once the device has been running for a couple of hours. Some air purifiers are even equipped with a sensor that tests the air quality and automatically adjusts the device’s setting accordingly!
To calculate the cost of an air purifier’s power consumption, you’ll need:
An air purifier’s power is generally expressed in watts (W). In order to calculate how much it will cost to run, we first need to determine the amount of energy used in kilowatt hours (kWh).
(power in watts x hours used daily) / 1000 = kWh per day
Then, all you need to do is multiply the result by the cost of electricity in your area to determine the daily cost of running your air purifier.
kWh per day x cost of electricity = daily cost of running the device
Calculating an air purifier’s electricity cost: an example
As an example, let’s take Sanuvox’s Sanuvair S300 residential UV air purifier, which covers up to 4,000 sq. ft. Its power is 180W, and let’s say it’s being used all day (24 hrs) in the province of Quebec.
(180W x 24) / 1000 = 4.32 kWh per day
Use a nationwide average to calculate electricity cost for the first 40 kWh used per day. We’ll use that rate to complete your calculation.
Despite being powerful enough to provide air cleaning for an entire large house, the Sanuvair S300 air purifier only costs $0.27 per day in electricity use, and that’s when running continuously at the highest setting.
While air purifiers don’t use a lot of electricity, there are things you can do to make them even more energy efficient:
With the rising cost of living and the climate crisis, it is completely valid to be concerned about your energy consumption. Fortunately, breathing cleaner air with the help of an air purifier doesn’t come at a high cost—for your wallet or the planet!
Sanuvox offers a range of residential and commercial UV air purifiers that are very effective at deactivating and help to reduce all kinds of chemical and biological contaminants. Browse our online shop or contact us today to explore our energy-efficient options!