TOPGREENER Humidity Sensor Fan Control Switch - Auto Ventilation

In this review of the TOPGREENER Humidity Sensor and Fan Control Switch the bottom line is simple: it is a practical, no-nonsense solution for automatically removing excess moisture from small rooms. The switch is aimed at homeowners and renters who want a simple way to run a ventilation fan only when humidity climbs, and the single biggest reason to buy is the automatic humidity-triggered operation that removes guesswork and helps prevent mold and mildew in bathrooms, laundry rooms or basements.

Key Features

• Automatic humidity detection: The switch senses excess humidity and turns the ventilation fan on so the room is ventilated without manual intervention.
• Selectable humidity levels: Three settings let the user choose low, medium or high trigger points to suit the specific ventilation needs of the space.
• Built-in time delay: A 20 minute delay keeps the fan running long enough after humidity drops to clear residual moisture.
• Manual bypass: The humidity sensor can be bypassed by manually switching the fan off when it is already on, offering straightforward control when needed.
• Wall plate included: Each pack includes one decorator wall plate for a finished install without hunting for parts.
• UL-Listed and warranted: The switch is UL-Listed and comes with a 1-year warranty for basic peace of mind.

Who It's For

The TOPGREENER humidity switch is best for homeowners, landlords and DIY-minded renters who want to automate a single exhaust fan on a 120VAC circuit and have a neutral wire available in the wall box. It is well suited to bathrooms, small laundry rooms and basements that experience intermittent high humidity.

It is not the best choice for multi-location or 3-way switching, high load fans above 3A, or installations where a neutral wire is not present. Buyers who need advanced programming, precise calibration beyond basic low/medium/high settings, or commercial-grade sensing should look elsewhere.

Pros & Cons

Pros

• Automatically activates a ventilation fan when humidity is high, reducing manual checks.
• Easy to install for users with a neutral wire and basic wiring experience; many reviewers find installation straightforward.
• Three humidity set points and a 20 minute delay provide simple customization to match room needs.
• Includes a decorator wall plate and comes in a 2-pack for multiple rooms or spares.

Cons

• Some users report inconsistent sensing or limited adjustment ability, so performance can vary by environment.
• Single-pole only and limited to 3A maximum fan load, restricting use with larger fans.

Specifications

Brand	TOPGREENER
Model	Humidity Sensor and Fan Control Switch TDHS5
Voltage	120VAC
Maximum fan load	3A
Humidity range	45% - 80%
Time delay	20 minutes
Warranty and safety	1-year warranty, UL-Listed

Our Verdict

The TOPGREENER humidity sensor switch is a practical, affordable option for automating small ventilation fans where a neutral wire exists; it offers useful features like three trigger levels and a 20 minute delay and represents good value for routine residential moisture control. Those who need high precision sensing or higher load capacity should consider higher-end or dedicated ventilation controllers instead.

Frequently Asked Questions

Does this switch require a neutral wire?
Yes, the device requires a neutral wire for installation and is intended for single-pole use only.

What fan size can it control?
The switch is rated for a maximum fan load of 3A on a 120VAC circuit, so it is suitable for most small bathroom and laundry fans but not high-power motors.

Can the humidity threshold be adjusted?
Yes, there are three humidity settings (low, medium, high) to choose the trigger point between about 45% and 80% relative humidity.