Ceiling Fan vs. Air Conditioner Cost Calculator
Compare running costs and calculate how much you'd save by using ceiling fans to reduce AC use.
Frequently Asked Questions
How much does a ceiling fan cost to run vs. air conditioning?
A ceiling fan uses 15–75W depending on speed and size. At medium speed, most fans use 30–55W. An average central AC unit uses 3,000–5,000W. Running a ceiling fan costs about $0.001–$0.007/hour; running AC costs $0.30–$0.65/hour. A ceiling fan is roughly 50–100× cheaper to run than central AC.
Can a ceiling fan replace air conditioning?
No — ceiling fans don't cool the air. They create a wind-chill effect that makes you feel 4–8°F cooler by accelerating sweat evaporation. But if no one is in the room, the fan wastes electricity. Ceiling fans should supplement AC by allowing you to raise the thermostat 4°F without feeling warmer — saving 10–15% on AC costs per degree raised. Always turn fans off when leaving a room.
What is the most efficient fan speed?
Lower speeds are disproportionately efficient. A fan at low speed might use 15W, medium speed 40W, and high speed 70W — but the perceived cooling benefit increases less steeply than power consumption. Use the lowest speed that feels comfortable. For sleeping, low speed is usually sufficient. High speed uses 3–5× more power than low speed.
How much can I raise my thermostat with a ceiling fan?
The DOE recommends raising your thermostat by 4°F when using ceiling fans without discomfort. Since AC costs increase ~3% per degree of cooling, raising the setpoint from 72°F to 76°F saves roughly 12% on cooling costs. With an annual cooling bill of $600, that's $72/year — far exceeding the added ceiling fan electricity cost of $5–$20/year.
Should I run the ceiling fan in winter?
Yes — in reverse (clockwise looking up). This pushes warm air that accumulates at the ceiling down along the walls without creating a cooling breeze. At low speed on a warm setting, this can reduce heating costs by 5–15% by eliminating cold spots and allowing a lower thermostat setting. Most fans have a reverse switch or can be reversed in the app.