Cost to Run a 20-watt evaporative humidifier for 5 hours in Washington
Running a 20-watt evaporative humidifier for 5 hours uses 0.1 kWh and costs $0.012 at $0.115/kWh in Washington. Do that every day and it adds up to $0.345 a month.
Calculate your own cost
- Per hour
- $0.0020.02 kWh
- Per day
- $0.0120.1 kWh
- Per week
- $0.0810.7 kWh
- Per month (30 days)
- $0.3453 kWh
- Per year
- $4.2036.5 kWh
Formula: watts ÷ 1,000 × hours × rate. Edit any box and every number updates instantly.
People also ask
How much does a 20-watt evaporative humidifier cost per hour?
At $0.115/kWh, it costs $0.002 per hour. The maths: 20 W ÷ 1,000 = 0.02 kWh per hour, × $0.115 = $0.002.
How much does it cost per month?
Used 5 hours a day for 30 days, it costs about $0.345 per month and uses 3 kWh. Change the hours in the calculator above to match how you use it.
How many kWh does it use?
0.1 kWh per day, 3 kWh per month and 36.5 kWh per year at 5 hours a day. A kWh is one kilowatt (1,000 W) used for one hour. It is the unit on your electricity bill.
How can I lower the cost?
Clean the unit as directed and use a humidistat to avoid unnecessary runtime. Check your bill for the exact rate and enter it above.
Does my electricity rate change the answer?
Yes, a lot. At 10¢ per kWh the monthly cost is $0.30 and at 30¢ it is $0.90. Find your rate on your bill (total cost ÷ kWh used) and type it into the calculator.
Cost by hours of use in Washington
| Used per day | Energy per day | Cost per day | Cost per month | Cost per year |
|---|---|---|---|---|
| 1 hour | 0.02 kWh | $0.002 | $0.069 | $0.84 |
| 2 hours | 0.04 kWh | $0.005 | $0.138 | $1.68 |
| 3 hours | 0.06 kWh | $0.007 | $0.207 | $2.52 |
| 4 hours | 0.08 kWh | $0.009 | $0.276 | $3.36 |
| 5 hours | 0.1 kWh | $0.012 | $0.345 | $4.20 |
| 6 hours | 0.12 kWh | $0.014 | $0.414 | $5.04 |
| 7 hours | 0.14 kWh | $0.016 | $0.483 | $5.88 |
| 8 hours | 0.16 kWh | $0.018 | $0.552 | $6.72 |
| 9 hours | 0.18 kWh | $0.021 | $0.621 | $7.56 |
| 10 hours | 0.2 kWh | $0.023 | $0.69 | $8.40 |
| 11 hours | 0.22 kWh | $0.025 | $0.759 | $9.23 |
| 12 hours | 0.24 kWh | $0.028 | $0.828 | $10.07 |
| 13 hours | 0.26 kWh | $0.03 | $0.897 | $10.91 |
| 14 hours | 0.28 kWh | $0.032 | $0.966 | $11.75 |
| 15 hours | 0.3 kWh | $0.035 | $1.04 | $12.59 |
| 16 hours | 0.32 kWh | $0.037 | $1.10 | $13.43 |
| 17 hours | 0.34 kWh | $0.039 | $1.17 | $14.27 |
| 18 hours | 0.36 kWh | $0.041 | $1.24 | $15.11 |
| 19 hours | 0.38 kWh | $0.044 | $1.31 | $15.95 |
| 20 hours | 0.4 kWh | $0.046 | $1.38 | $16.79 |
| 21 hours | 0.42 kWh | $0.048 | $1.45 | $17.63 |
| 22 hours | 0.44 kWh | $0.051 | $1.52 | $18.47 |
| 23 hours | 0.46 kWh | $0.053 | $1.59 | $19.31 |
| 24 hours | 0.48 kWh | $0.055 | $1.66 | $20.15 |
How we worked it out
- Energy per hour: 20 W ÷ 1,000 = 0.02 kWh
- Cost per hour: 0.02 kWh × $0.115 = $0.002
- Cost per day: × 5 hours = $0.012
- Month and year: × 30 days = $0.345, × 365 days = $4.20
Washington electricity prices
Washington pays about $0.115 per kWh, which is 34% lower than the US average of $0.175. The same evaporative humidifier would cost $0.525 a month at the national average.
What it costs in different places
Same 20-watt evaporative humidifier, 5 hours a day. Only the local electricity rate changes.
| Place | Rate per kWh | Cost per month |
|---|---|---|
| United States | $0.175 | $0.525 |
| California | $0.32 | $0.96 |
| Texas | $0.155 | $0.465 |
| New York | $0.25 | $0.75 |
| Florida | $0.155 | $0.465 |
| Illinois | $0.17 | $0.51 |
| Pennsylvania | $0.18 | $0.54 |
| Ohio | $0.17 | $0.51 |
| Washington | $0.115 | $0.345 |
About evaporative humidifier running costs
Evaporative humidifiers mainly power a fan and sometimes a small pump. Their energy use depends on fan speed and model design.
Typical sizes: 20 W, 30 W, 50 W, 80 W.
How to spend less: Clean the unit as directed and use a humidistat to avoid unnecessary runtime.
What this estimate assumes
- The appliance draws its full stated wattage the whole time it is on. Real units with a thermostat cycle off and cost less.
- Wattage is the typical label value, not a measured value. Check the label on your own appliance.
- The rate is an approximate residential average in Washington. Your bill may include fixed fees, tiers or time-of-use pricing. Edit the rate above.
- A month is 30 days and a year is 365 days.