Installing a humidity sensor in your bathroom can automatically control the exhaust fan to prevent mold and mildew issues. A humidity sensor turns the fan on when moisture levels rise, such as after a shower, and off again once the air is dry. This saves energy and fan life compared to manual control. The installation is a basic DIY project requiring some electrical skills but following safety procedures. A video demonstrates installing and adjusting a humidity sensor to properly control humidity levels in the bathroom.

1. Install a Humidity Sensor And Prevent Mold in Your Bathroom | isweek - Industry
sourcing
Stop worrying about turning your bathroom exhaust fan on and off. Instead, install a
humidity sensor that automatically controls the fan switch.
Installing a humidity sensor in your bathroom is a project most DIYers can handle on their
own, and one that could save your walls from mildew problems later. Having a modicum
of electrical experience is helpful but not necessary, as long as you follow some basic
safety standards.
Bathroom exhaust fans are vital to controlling air moisture levels while taking a bath or
shower. This is important to prevent mildew and mold from taking hold on your walls or
ceilings. Most people turn off the fan as soon as they're out of the shower, but that's a
mistake. The fan should be left on for a few minutes after your shower to get the air back
down to an acceptable moisture level.
The tough part is remembering to go back later and turn the fan off. This is an especially
hard concept for kids to understand, as they are always off to the next thing. If left on, the
running fan wastes electricity and shortens the lifespan of your fan. So, install a humidity
sensor that's connected to your fan, and automatically shuts it off when appropriate.
In the video above, an electrician demonstrates how to install a humidity sensor as well
as adjust it to meet your humidity control needs. The Leviton sensor shown also has a
manual on/off control and requires a switch box with a neutral wire to install.
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