How Much Does It Cost to Run Attic Fan?
An attic fan knocks down attic temperatures for a few hundred watts, easing the load on AC below. At the US-average rate of 16.5¢/kWh, running an attic fan costs about $9.02/month ($108.27/year) at typical use. Adjust the watts, hours, and your rate below for your exact number.
Cost to run an attic fan
$108/yr
- Per day
- $0.30
- Per month
- $9.02
- Energy per year
- 657 kWh
Cost = power (kW) × hours × days × your rate. Defaults are typical values — enter your appliance's actual watts (often on a label) and your real rate for a precise figure.
Cost to run an attic fan by electricity rate
Same 300 W appliance, 6 h/day — the bill changes with where you live.
| Scenario | Rate | Per month | Per year |
|---|---|---|---|
| Cheapest states (North Dakota) | 11.5¢ | $6.30 | $75.62 |
| US average | 16.5¢ | $9.02 | $108.27 |
| Most expensive (Hawaii) | 42.9¢ | $23.47 | $281.59 |
Find your state's rate on the electricity rates by state page, or see the appliance wattage chart for more devices.
Frequently asked questions
At the US-average residential rate of 16.5¢/kWh, an attic fan drawing 300 watts for about 6 hours a day costs roughly $0.30 per day, $9.02 per month, and $108.27 per year. Your actual cost depends on your electricity rate and how much you use it — adjust both in the calculator above.
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