How Many kWh Does a Attic Ventilation Fan Use?
Attic Ventilation Fan energy cost calculator — see your exact daily, monthly, and yearly electricity cost.
US national average. Edit for your local rate.
Daily Energy Use
1.80
kWh / day
Monthly Cost
$10.17
Yearly Cost
$123.71
Attic Ventilation Fan — Cost Breakdown
| Period | kWh Used | Cost ($) |
|---|---|---|
| Per Hour | 0.3000 | $0.0565 |
| Per Day | 1.80 | $0.34 |
| Per Month (30 days) | 54.00 | $10.17 |
| Per Year (365 days) | 657.00 | $123.71 |
Running an attic fan for 6 hours uses about the same energy as running a window AC for 1.5 hours.
3 Ways to Cut Your Attic Ventilation Fan Energy Bill
- 🌱
Install a thermostat set to 100–110°F so the fan only runs when attic temperatures are actually elevated.
- 💡
Switch to a solar-powered attic fan — it operates for free during peak solar hours when attic heat is highest.
- ⚡
Ensure soffit vents are clear and unblocked so the fan can pull cool outside air efficiently rather than straining against resistance.
The fan motor draws a startup surge of about 600–900W for a few seconds before settling to its running wattage.