Of all electronic devices you’ll find in a home, air purifiers use a small amount of electricity. In fact, air purifier filters cost more annually than the electricity it takes to run the air cleaner itself.

We’ll do our calculations using a modern Medify air purifier made for large rooms.

## Measuring air purifier electricity use

Calculating how much electricity anything in the home uses is simple. We only need to know a few things.

First, we need to know the **wattage of the air purifier.** This can be found on the manufacturer’s website, on the air purifier itself, or in the manual it came with.

Second, we need to know **how long the air purifier will be in use**.

Finally, we need to know the **cost of electricity** in the home it will be used in. This can be found at your electricity company’s website or on your monthly electricity bill.

**Here’s the equation for daily use:**

*Air Purifier Wattage × Hours Used Per Day x 365 Days ÷ 1000 x Electricity Cost (kWh) = Annual Cost of Electricity*

The equation can be used not only for air purifiers, but also for an air scrubber, ozone generator or any other household appliance or electronic device.

### Calculating the cost of running an air purifier annually:

The steps to run an air purifier can be calculated with the instructions below.

Time needed: 5 minutes.

How to calculate annual air purifier electricity cost

**Calculate air purifier daily energy consumption**Multiply the air purifier wattage x hour used per day

**Calculate annual air purifier energy consumption**Multiply the daily energy consumption from Step 1 x days per year the air purifier will be used

**Calculate the electrical cost to operate the air purifier**Divide the annual air purifier energy consumption from Step 2 by 1000 and then multiply that amount x the cost of electricity (kWh)

## Example: Air purifier annual electrical cost

In this example we’ll use a Medify air purifier which consumes 68 **watts of electricity while in use**.

We will run the air purifier 8 **hours per day**, **every day** of the year in a home in Los Angeles where **electricity cost** is 22 cents per kilowatt hour (kWh).

Using the equation above, here’s our result:

**Air purifier daily energy consumption**: 68 w x 8 = 544**Annual air purifier energy consumption**: 544 x 365 = 198,560**Cost of operation annually**: 198,560 / 1000 * .22 = $43.68 a year

So, running this air purifier every day for eight hours a day where electricity cost is fairly high results in an annual cost under $45.

## Cost of air purifier electrical use vs. cost of air purifier filters

The cost of air purifier filters for this unit run around $60 and should be replaced every 4 or 5 months according to the manufacturer.

So, assuming we replace the air filter every 4 months, that would be 3 times in a year. 3 x $60 = $180, or more than triple the cost of electricity used by the air purifier.