Cost to Run a 30-watt evaporative humidifier for 10 hours in Ohio
Running a 30-watt evaporative humidifier for 10 hours uses 0.3 kWh and costs $0.051 at $0.17/kWh in Ohio. Do that every day and it adds up to $1.53 a month.
Calculate your own cost
- Per hour
- $0.0050.03 kWh
- Per day
- $0.0510.3 kWh
- Per week
- $0.3572.1 kWh
- Per month (30 days)
- $1.539 kWh
- Per year
- $18.62110 kWh
Formula: watts ÷ 1,000 × hours × rate. Edit any box and every number updates instantly.
People also ask
How much does a 30-watt evaporative humidifier cost per hour?
At $0.17/kWh, it costs $0.005 per hour. The maths: 30 W ÷ 1,000 = 0.03 kWh per hour, × $0.17 = $0.005.
How much does it cost per month?
Used 10 hours a day for 30 days, it costs about $1.53 per month and uses 9 kWh. Change the hours in the calculator above to match how you use it.
How many kWh does it use?
0.3 kWh per day, 9 kWh per month and 110 kWh per year at 10 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 $0.90 and at 30¢ it is $2.70. Find your rate on your bill (total cost ÷ kWh used) and type it into the calculator.
Cost by hours of use in Ohio
| Used per day | Energy per day | Cost per day | Cost per month | Cost per year |
|---|---|---|---|---|
| 1 hour | 0.03 kWh | $0.005 | $0.153 | $1.86 |
| 2 hours | 0.06 kWh | $0.01 | $0.306 | $3.72 |
| 3 hours | 0.09 kWh | $0.015 | $0.459 | $5.58 |
| 4 hours | 0.12 kWh | $0.02 | $0.612 | $7.45 |
| 5 hours | 0.15 kWh | $0.026 | $0.765 | $9.31 |
| 6 hours | 0.18 kWh | $0.031 | $0.918 | $11.17 |
| 7 hours | 0.21 kWh | $0.036 | $1.07 | $13.03 |
| 8 hours | 0.24 kWh | $0.041 | $1.22 | $14.89 |
| 9 hours | 0.27 kWh | $0.046 | $1.38 | $16.75 |
| 10 hours | 0.3 kWh | $0.051 | $1.53 | $18.62 |
| 11 hours | 0.33 kWh | $0.056 | $1.68 | $20.48 |
| 12 hours | 0.36 kWh | $0.061 | $1.84 | $22.34 |
| 13 hours | 0.39 kWh | $0.066 | $1.99 | $24.20 |
| 14 hours | 0.42 kWh | $0.071 | $2.14 | $26.06 |
| 15 hours | 0.45 kWh | $0.077 | $2.30 | $27.92 |
| 16 hours | 0.48 kWh | $0.082 | $2.45 | $29.78 |
| 17 hours | 0.51 kWh | $0.087 | $2.60 | $31.65 |
| 18 hours | 0.54 kWh | $0.092 | $2.75 | $33.51 |
| 19 hours | 0.57 kWh | $0.097 | $2.91 | $35.37 |
| 20 hours | 0.6 kWh | $0.102 | $3.06 | $37.23 |
| 21 hours | 0.63 kWh | $0.107 | $3.21 | $39.09 |
| 22 hours | 0.66 kWh | $0.112 | $3.37 | $40.95 |
| 23 hours | 0.69 kWh | $0.117 | $3.52 | $42.81 |
| 24 hours | 0.72 kWh | $0.122 | $3.67 | $44.68 |
How we worked it out
- Energy per hour: 30 W ÷ 1,000 = 0.03 kWh
- Cost per hour: 0.03 kWh × $0.17 = $0.005
- Cost per day: × 10 hours = $0.051
- Month and year: × 30 days = $1.53, × 365 days = $18.62
Ohio electricity prices
Ohio pays about $0.17 per kWh, which is 3% lower than the US average of $0.175. The same evaporative humidifier would cost $1.58 a month at the national average.
What it costs in different places
Same 30-watt evaporative humidifier, 10 hours a day. Only the local electricity rate changes.
| Place | Rate per kWh | Cost per month |
|---|---|---|
| United States | $0.175 | $1.58 |
| California | $0.32 | $2.88 |
| Texas | $0.155 | $1.40 |
| New York | $0.25 | $2.25 |
| Florida | $0.155 | $1.40 |
| Illinois | $0.17 | $1.53 |
| Pennsylvania | $0.18 | $1.62 |
| Ohio | $0.17 | $1.53 |
| Washington | $0.115 | $1.04 |
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 Ohio. 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.