In case your exhaust fan in the bathroom doesn’t have a humidity sensor, instead of spending on a new fan, you could add a small device on the wall, designed to add this missing function.
DewStop is a smart fan switch that monitors the humidity level in the room to automatically turn your exhaust fan on, when the humidity level is high, or off, when the air is back to normal. This way you can prevent mold growth and damage of the walls and goods inside the room. Besides this, you’d save your own energy because you won’t have to check for humidity in the air and turn the fan on and off.
DewStop installs by replacing the existing fan switch and uses the Condensation Sentry technology to detect condensation in the air. It turns off automatically when the air is dry, to save on your electricity bill. The switch has also a timer that you can set at 30 minutes. You can find it at DewStop.com in Switch Only version for $49, and Fan & Light Switch for $59.