Quest DEH 3000R Controller

Digital humidity control that keeps Quest dehumidifiers on target

The Quest DEH 3000R Controller is a digital environmental controller that gives precise command over humidity and ventilation when paired with a compatible Quest dehumidifier. A clear backlit LCD display shows relative humidity, temperature, date and time, making it easy to hold consistent conditions across hydroponic, coco and soil grows. It is built for the moisture surge of the bloom stage, when excess humidity turns into mould, airy buds and lost yield if it is not caught early. Compatible with Quest Dual 105, 155, 185, 205 and 225 dehumidifiers.

Key Benefits

• Precise digital humidity control with an adjustable %RH set point
• Large backlit LCD display showing humidity, temperature, date and time
• Programmable ventilation timer for better grow-room airflow
• Continuous or automatic fan operation to match your environment
• Built-in high-temperature cut-out for added protection
• Compatible with Quest commercial dehumidifiers (Dual 105/155/185/205/225)

Is humidity drift costing you bud density?

In sealed rooms and hydroponic setups, transpiration pushes out large amounts of moisture and humidity swings through the day without close control, raising mould risk during flowering and knocking nutrient uptake off track. The DEH 3000R lets you set a single humidity target and have the dehumidifier hold it automatically, while the ventilation timer clears stale air. Note that it runs one target rather than separate day and night settings.

How to Use

1. Install the controller where it reflects true ambient room conditions.
2. Connect it to a compatible Quest dehumidifier.
3. Power on and set your target relative humidity (%RH) on the digital interface.
4. Choose continuous or automatic fan operation to suit your ventilation.
5. Set the ventilation timer if controlling a motorised damper or vent system.
6. Monitor humidity and temperature on the display through veg and flowering.