Box or tower fans draw 40–100 watts and use energy proportional to how long they run. Running one overnight in a closed room wastes energy that could be saved by opening windows or using an A/C more selectively.
| Basis | Cost |
|---|---|
| Per hour (while running, 70 W typical) | $0.013 |
| Per day (8 h/day, 7/7 days) | $0.11 |
| Per month | $3.21 |
| Per year | $38.51 |
| Hourly range (small 40 W – large 110 W) | $0.008 – $0.021 |
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