🌡️ Climate Control
How Many kWh Does a Whole House Fan Use?
Whole House Fan energy cost calculator — see your exact daily, monthly, and yearly electricity cost.
Rate — MAY 2026
⚡ 300W typical
$
US national average. Edit for your local rate.
Daily Energy Use
1.20
kWh / day
Monthly Cost
$6.64
Yearly Cost
$80.77
Whole House Fan — Cost Breakdown
| Period | kWh Used | Cost ($) |
|---|---|---|
| Per Hour | 0.3000 | $0.0553 |
| Per Day | 1.20 | $0.22 |
| Per Month (30 days) | 36.00 | $6.64 |
| Per Year (365 days) | 438.00 | $80.77 |
⚡ Real-World Comparison
Running a whole house fan for 4 hours uses only about a tenth of the energy a central AC uses in the same time.
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3 Ways to Cut Your Whole House Fan Energy Bill
- 🌱
Open windows on the windward side of the house before turning on the fan to maximize cross-ventilation.
- 💡
Run it in the evening and early morning when outdoor air is coolest for maximum cooling benefit.
- ⚡
Install an insulated cover over the fan louvers in winter to prevent heat loss through the attic opening.
Startup Surge Information
The large motor draws a startup surge of roughly 600–900W for a few seconds before settling to its running wattage.
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