Cost to Run an 800-watt attic ventilation fan for 23 hours in California
Running an 800-watt attic ventilation fan for 23 hours uses 18.4 kWh and costs $5.89 at $0.32/kWh in California. Do that every day and it adds up to $176.64 a month.
Calculate your own cost
- Per hour
- $0.2560.8 kWh
- Per day
- $5.8918.4 kWh
- Per week
- $41.22129 kWh
- Per month (30 days)
- $176.64552 kWh
- Per year
- $2,149.126,716 kWh
Formula: watts ÷ 1,000 × hours × rate. Edit any box and every number updates instantly.
People also ask
How much does an 800-watt attic ventilation fan cost per hour?
At $0.32/kWh, it costs $0.256 per hour. The maths: 800 W ÷ 1,000 = 0.8 kWh per hour, × $0.32 = $0.256.
How much does it cost per month?
Used 23 hours a day for 30 days, it costs about $176.64 per month and uses 552 kWh. Change the hours in the calculator above to match how you use it.
How many kWh does it use?
18.4 kWh per day, 552 kWh per month and 6,716 kWh per year at 23 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?
Use the right control settings and ensure the attic has adequate intake vents. 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 $55.20 and at 30¢ it is $165.60. Find your rate on your bill (total cost ÷ kWh used) and type it into the calculator.
Cost by hours of use in California
| Used per day | Energy per day | Cost per day | Cost per month | Cost per year |
|---|---|---|---|---|
| 1 hour | 0.8 kWh | $0.256 | $7.68 | $93.44 |
| 2 hours | 1.6 kWh | $0.512 | $15.36 | $186.88 |
| 3 hours | 2.4 kWh | $0.768 | $23.04 | $280.32 |
| 4 hours | 3.2 kWh | $1.02 | $30.72 | $373.76 |
| 5 hours | 4 kWh | $1.28 | $38.40 | $467.20 |
| 6 hours | 4.8 kWh | $1.54 | $46.08 | $560.64 |
| 7 hours | 5.6 kWh | $1.79 | $53.76 | $654.08 |
| 8 hours | 6.4 kWh | $2.05 | $61.44 | $747.52 |
| 9 hours | 7.2 kWh | $2.30 | $69.12 | $840.96 |
| 10 hours | 8 kWh | $2.56 | $76.80 | $934.40 |
| 11 hours | 8.8 kWh | $2.82 | $84.48 | $1,027.84 |
| 12 hours | 9.6 kWh | $3.07 | $92.16 | $1,121.28 |
| 13 hours | 10.4 kWh | $3.33 | $99.84 | $1,214.72 |
| 14 hours | 11.2 kWh | $3.58 | $107.52 | $1,308.16 |
| 15 hours | 12 kWh | $3.84 | $115.20 | $1,401.60 |
| 16 hours | 12.8 kWh | $4.10 | $122.88 | $1,495.04 |
| 17 hours | 13.6 kWh | $4.35 | $130.56 | $1,588.48 |
| 18 hours | 14.4 kWh | $4.61 | $138.24 | $1,681.92 |
| 19 hours | 15.2 kWh | $4.86 | $145.92 | $1,775.36 |
| 20 hours | 16 kWh | $5.12 | $153.60 | $1,868.80 |
| 21 hours | 16.8 kWh | $5.38 | $161.28 | $1,962.24 |
| 22 hours | 17.6 kWh | $5.63 | $168.96 | $2,055.68 |
| 23 hours | 18.4 kWh | $5.89 | $176.64 | $2,149.12 |
| 24 hours | 19.2 kWh | $6.14 | $184.32 | $2,242.56 |
How we worked it out
- Energy per hour: 800 W ÷ 1,000 = 0.8 kWh
- Cost per hour: 0.8 kWh × $0.32 = $0.256
- Cost per day: × 23 hours = $5.89
- Month and year: × 30 days = $176.64, × 365 days = $2,149.12
California electricity prices
California pays about $0.32 per kWh, which is 83% higher than the US average of $0.175. The same attic ventilation fan would cost $96.60 a month at the national average.
What it costs in different places
Same 800-watt attic ventilation fan, 23 hours a day. Only the local electricity rate changes.
| Place | Rate per kWh | Cost per month |
|---|---|---|
| United States | $0.175 | $96.60 |
| California | $0.32 | $176.64 |
| Texas | $0.155 | $85.56 |
| New York | $0.25 | $138.00 |
| Florida | $0.155 | $85.56 |
| Illinois | $0.17 | $93.84 |
| Pennsylvania | $0.18 | $99.36 |
| Ohio | $0.17 | $93.84 |
| Washington | $0.115 | $63.48 |
About attic ventilation fan running costs
Attic fans use a motor for ventilation. Actual power depends on fan size and whether a thermostat or humidistat controls it.
Typical sizes: 150 W, 300 W, 500 W, 800 W.
How to spend less: Use the right control settings and ensure the attic has adequate intake vents.
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 California. 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.