Find out how much energy a fan running all night actually uses, how it compares to air conditioning, and practical tips to help you save on your summer electricity bill.
Staying Cool at Night—But at What Cost?
During hot and humid summer nights, many people leave a fan on while sleeping to stay comfortable. But how much energy does it really consume when left on for hours? And more importantly, how much does it add to your electricity bill?
How Many Watts Does a Fan Use Over 8 Hours?
Energy consumption depends on the power of the device, which varies by type and model. On average:
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Table fan: 40–50 watts
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Pedestal (standing) fan: Up to 75 watts
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Ceiling fan: 60–80 watts
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Tower fan (modern design): Around 45–60 watts
Let’s take a 50-watt fan running for 8 hours as a reference:
50 W × 8 hours = 400 Wh = 0.4 kWh
How Much Does It Cost to Keep a Fan On All Night?
Assuming an average electricity rate of $0.25 per kWh, the nightly cost is:
0.4 kWh × $0.25 = $0.10 per night
Used every night for a month, the total would be around:
$0.10 × 30 nights = $3.00 per month
That’s a modest expense—especially when compared to the cost of using air conditioning.
Fan vs. Air Conditioner: A Clear Energy Comparison
A fan, even when running all night, uses significantly less energy than an air conditioner. Here’s a simple breakdown:
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Fan (8 hours): ~0.4 kWh → $0.10 per night
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Air conditioner (8 hours): 2–2.5 kWh → $0.60–$0.70 per night
Over a month, that’s $3 for a fan versus $18–$21 for an AC unit—5 to 6 times more!
Tips to Save Even More Energy This Summer
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