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How Much Does It Cost to Run a Humidifier? (2026)
Ultrasonic and evaporative humidifiers draw 20 to 50 watts. Warm mist models boil water and draw 250 to 300 watts, making them five to ten times more expensive to run.
A typical humidifier (40 W) costs $0.007 per hour, or about $2.16 per month at 10 hours a day in United States (average). Cheap to run
| Wattage | Per hour | Per day | Per month | Per year |
|---|---|---|---|---|
| Low (20 W) | $0.004 | $0.036 | $1.08 | $13.14 |
| Typical (40 W) | $0.007 | $0.072 | $2.16 | $26.28 |
| High (300 W) | $0.054 | $0.54 | $16.20 | $197.10 |
Formula: watts ÷ 1000 × hours × price per kWh. Typical use is 10 h/day ≈ 146 kWh per year.
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How to lower the cost of running a humidifier
- Choose cool mist over warm mist. The humidity result is the same.
- Use a hygrometer and stop at 40 to 50 percent humidity.
- Clean it weekly. Mineral buildup makes ultrasonic models work harder.
In standby it draws about 1 W, which adds roughly 9 kWh ($1.58) per year if it is never unplugged.
Frequently asked questions
How much does it cost to run a humidifier all night?
A 40 watt cool mist unit for 10 hours uses 0.4 kWh.
Do warm mist humidifiers use a lot of electricity?
Yes. At 300 watts they use as much as a small heater.
Does a humidifier use power when the tank is empty?
Most shut off automatically and draw about a watt.
Cost by region
- United States (average)
- California
- Texas
- New York
- Florida
- Canada (average)
- United Kingdom
- Germany
- France
- Australia
- India