Ceiling fan vs aircon: what actually saves you money on your SP bill?

The Singapore electricity tariff in 2026 sits around 32 cents per kWh (it floats with global energy prices — check your most recent SP bill for the exact rate). That number is the key to figuring out whether your aircon habit is eating your salary, and whether a ceiling fan would actually save you anything.

The wattage reality check

Here's how much power common cooling options actually draw:

• 56" DC ceiling fan, low speed: 8–15 watts
• 56" DC ceiling fan, max speed: 28–35 watts
• 56" AC ceiling fan, max speed: 60–75 watts
• 9,000 BTU aircon (small bedroom), running: 700–900 watts
• 12,000 BTU aircon (medium bedroom): 900–1,300 watts
• 18,000 BTU aircon (living room): 1,400–2,000 watts

A modern DC fan draws roughly 40× less electricity than the bedroom aircon it would replace. That ratio doesn't even include the compressor cycling — aircons draw closer to their peak only when actively cooling, but they cycle on/off all night.

What it costs you, per night

Assume 8 hours of overnight use at 32¢/kWh.

• DC ceiling fan, medium speed (20W): 20W × 8h ÷ 1000 × $0.32 = ~5 cents/night
• 9,000 BTU aircon at 24°C (avg 800W): 800W × 8h ÷ 1000 × $0.32 = ~$2.05/night
• 12,000 BTU aircon at 22°C (avg 1100W): 1100W × 8h ÷ 1000 × $0.32 = ~$2.82/night

Over a month:

• DC fan every night: ~$1.50/month
• 9,000 BTU aircon every night: ~$61/month
• 12,000 BTU aircon every night: ~$85/month

Numbers in real homes vary — newer inverter aircons cycle down once the room is cool, so actual usage can be 30–40% lower than the peak draw. Older non-inverter units run closer to peak.

Why fans alone aren't always enough

On a 32°C Singapore afternoon, a fan moves air but doesn't cool it. You feel cooler because moving air evaporates sweat faster, but the room is still 32°C. For sleeping, that often isn't enough on the hottest nights.

Where fans dominate aircon:

• Evenings under 30°C — fan alone is plenty
• Active spaces during the day — kitchen, study, living when you're moving around
• Rooms you're in briefly — bathroom getting ready, dressing area

The hybrid strategy (this is the actual money-saver)

Running fan + aircon together is the trick that gets you cool air at much lower cost than aircon alone.

The principle

Set your aircon 2°C higher than you normally would (e.g. 26°C instead of 24°C). Turn the ceiling fan on medium. The fan circulates the cool air faster, making 26°C feel like 23°C — and your aircon now uses ~30% less electricity because it's working against a smaller temperature gap.

At today's SP rates, this typically saves $15–$30 per month on a bedroom aircon used every night. A DC fan costing $400 pays for itself in 18 months — and you sleep just as cool.

Common myths

"Leave the fan running so the cool air circulates"

Half-right. Ceiling fans cool people, not rooms. Running a fan in an empty room saves nothing — turn it off when you leave. The circulation effect is only useful when there are people in the room to feel the air movement.

"DC fans use the same power as AC fans"

False. DC fans use roughly 50–70% less power at equivalent airflow. The brushless motor design is just more efficient. The difference is a real, measurable line item on your SP bill.

"Aircon on 18°C cools the room faster"

False. Aircons cool at a fixed rate — setting it lower just makes it keep running longer. Set it to your target temperature (24–26°C) and pair with a fan for the "feels cooler" effect.

The takeaway

Ceiling fans don't replace aircon in Singapore — but they radically change the maths. Used together, you can sleep at the same comfort level for half the electricity cost.

If you don't have a ceiling fan in your bedroom, the upgrade will pay for itself within 2 years on bill savings alone — and you'll sleep noticeably better in the months between.