Air purifiers are energy-friendly devices. A medium-sized air purifier consumes 50 watts of electricity on average. Most of the power is drawn by the fan of the air purifier. If you run it for 12 hours a day at the maximum fan speed, it will cost only $2.15 per month (let’s assume the electricity rate is 12 cents/kWh).
Also, you don’t have to leave the unit at the maximum fan speed all the time. EPA recommends running the air purifier at the lowest fan speed 24/7. In this case, power consumption will be much lower.
This air purifier electricity consumption calculator can easily calculate your daily and monthly energy usage in kilowatt-hour and USD.
Check out our top picks >>> The 7 Best Energy Star Rated Air Purifiers.
Air Purifier Electricity Consumption Calculator:
Enter your air purifier’s power rating in watts, daily usage in hours, and your local energy rate (cents per kilowatt-hour) to calculate the approximate daily and monthly kWh (kilowatt-hour) usage and the cost in USD by your air purifier.
Here is the formula:
Monthly Electricity Usage = [(Power in watts x Daily usage in hours)/1000 x 30] kWh, and
Monthly Electricity Cost = [(Monthly Electricity Usage in kWh x Energy rate per kWh in cents)/100] USD