Leviton Humidity Sensor Switch for Bathroom Fan - Automatic

Our review of the Leviton Humidity Sensor Switch finds it best for homeowners and renters who want a set-and-forget solution to bathroom moisture. The single biggest reason to buy is its reliable automatic humidity detection that runs an exhaust fan when moisture rises, helping prevent mold and lingering damp. Installation is straightforward for anyone comfortable with basic wiring, and the slim Decora profile means it blends into most bathrooms without crowding the wallbox.

Key Features

• Automatic humidity control: The sensor detects rising moisture and turns the exhaust fan on and off without manual intervention, protecting against damp and mold.
• Easy installation: The slim profile fits most wallboxes and the clear wiring makes setup manageable for DIYers or electricians.
• No neutral required: Can be installed with or without a neutral wire so it works in older homes that lack a neutral at the switch.
• Interchangeable line/load: Line and load wires are interchangeable which simplifies wiring and reduces installation errors.
• Adjustable without tools: Settings can be changed without removing the faceplate or a wallplate, making on-the-fly adjustments quick and simple.
• Code compliant capability: Can be used to meet 2019 and 2022 California Title 24 and CALGREEN requirements, supporting indoor air quality and ventilation standards.

Who It's For

The Leviton humidity sensor switch is ideal for homeowners, landlords, and contractors who need an unobtrusive, automatic method to control bathroom or utility room ventilation. It fits bathrooms, basements, laundry rooms, and spas where moisture control is a recurring concern and where an automatic solution reduces manual switching.

It is less suitable for projects that require multi-location three-way switching or for users who need fan speed control rather than simple on/off activation. Also consider alternatives if you need an integrated timer with advanced smart-home connectivity beyond simple humidity-based automation.

Pros & Cons

Pros

• Automatic turn on and programmable auto-turnoff keeps rooms dry without remembering to flip a switch.
• Works with or without a neutral, offering flexibility in older and newer wiring setups.
• Slim Decora profile and interchangeable wiring make installation tidy and forgiving.
• Meets relevant ventilation codes and standards for indoor air quality compliance.

Cons

• Does not provide multi-location three-way switching, so not ideal for some layouts.
• Wallplate sold separately, so buyers must ensure they have a compatible Decora plate.

Specifications

Our Verdict

The Leviton Humidity Sensor Switch is a practical, well-built choice for controlling bathroom ventilation automatically and avoiding moisture problems. It offers excellent value for most residential installs because it is easy to wire, fits standard wallboxes, and supports code compliance. Buy it if you want reliable automatic fan control without smart-home complexity.

Frequently Asked Questions

Can this switch be installed in an older home without a neutral?
Yes. The switch supports installation with or without a neutral, making it suitable for many older wiring setups.

Will it run my exhaust fan and lighting together?
This unit is a single pole fan control; it controls the fan circuit and is rated for specified lighting loads separately but does not simultaneously control separate light and fan circuits from one device.

Is a wallplate included?
No. The wallplate is sold separately, so plan to purchase a compatible Decora wallplate if you do not already have one.