Running a bathroom fan continuously typically costs about $11-$110 per year for a standard 10-50-watt model, depending mainly on its wattage and local electricity rate. Larger or older fans can cost more, while an efficient fan may use less; the estimates below cover electricity only, not installation or repairs.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Electricity per year | $11 | $39 | $110 | 10-50 watts; $0.12-$0.25 per kWh |
| Electricity per month | $0.90 | $3.25 | $9.13 | Fan runs 24 hours daily |
| Electricity per day | $0.03 | $0.11 | $0.30 | Rounded estimates |
Start by checking the actual wattage and whether the fan is designed for continuous operation. Use a timer or appropriate humidity control if the fan does not need to run all day, and avoid leaving an integrated heater or light on continuously. Cleaning the grille and keeping the air path clear can also help maintain airflow, though it does not change the fan’s rated electrical draw.
For a quote to replace or rewire a fan, compare the same scope across contractors: unit type, duct or wiring work, disposal, and any ceiling repairs. Reducing unnecessary operating hours is usually the simplest way to lower the recurring cost without changing the fan.