GAS Dual VPD Intelligent Humidity Controller - Runs a Humidifier and Dehumidifier Together
Best for: growers who need both a humidifier and a dehumidifier managed automatically from one controller, rather than running two separate systems.
Our thoughts
Most humidity controllers only run one device - a humidifier or a dehumidifier, not both. This one runs both from the same unit, which matters more than it sounds: rooms swing between too dry and too humid across a grow cycle, and having one controller coordinate both jobs avoids the two systems working against each other.
The G.A.S Intelligent Humidity Controller Dual gives you full automatic control over your grow room's humidity by managing both a humidifier and a dehumidifier from the same unit - dual outputs let you run both simultaneously, with the controller deciding which one needs to activate based on real-time conditions.
It uses a digital humidity sensor to continuously monitor your room and calculates Vapour Pressure Deficit (VPD) using both humidity and temperature readings, maintaining the optimum level for your plants' current growth stage rather than a fixed percentage target. Day and night settings let your targets shift automatically with your light cycle, and a built-in data logger records temperature and humidity for up to 7 days so you can check how your room has actually performed. It works with any 230V humidifier or dehumidifier up to 320W - including all of G.A.S's own SonicAir humidifiers - and installation is plug and play, with no additional wiring required.
How it compares
Dual-output control is the key differentiator from most single-device humidity controllers.
- Versus G.A.S's own single-output Intelligent Humidity/VPD Controller: that model runs one device (typically a humidifier); the Dual version coordinates a humidifier and dehumidifier together.
- Versus TrolMaster's DSH device station modules: TrolMaster's 240V module handles up to 10A for a single humidifying device and needs a compatible Hydro-X base station; the G.A.S Dual works as a self-contained unit covering both directions of humidity control.
- Versus running a humidifier and dehumidifier on separate basic controllers: separate units can fight each other if their targets don't align; the Dual controller manages both from shared sensor data.
If your room genuinely swings both too dry and too humid across its cycle, the Dual's combined control is worth the step up from a single-output unit.
Usage guidance
Setup is plug and play with no additional wiring.
Connecting devices
Plug your humidifier into one output and your dehumidifier into the other - both can run from the same controller, up to 320W each.
Setting targets
Choose humidity or VPD control on the LCD screen, and set day/night targets to match your growth stage and light cycle.
Reviewing performance
Use the built-in 7-day data logger to check how humidity and temperature have tracked in your room over time.
Technical specifications
- Control type: Dual-output automatic humidity / VPD controller
- Manufacturer: Global Air Supplies (G.A.S UK)
- Outputs: 2 (humidifier and dehumidifier, simultaneous operation)
- Device compatibility: Any 230V humidifier or dehumidifier up to 320W, including all G.A.S SonicAir models
- Sensor: Digital humidity sensor with VPD calculation
- Scheduling: Separate day and night settings
- Data logging: Records temperature and humidity for up to 7 days
- Display: LCD screen with straightforward controls
Who this is for
- Growers running both a humidifier and a dehumidifier who want them coordinated
- Anyone whose room swings between too dry and too humid across a grow cycle
- Growers who want VPD-based targets rather than a fixed humidity percentage
Best suited to rooms with genuine two-way humidity swings rather than a consistently dry or consistently damp space.
Our take
Running both a humidifier and dehumidifier from one brain rather than two separate systems is a genuinely practical upgrade if your room needs it - it removes the risk of both devices working against each other.
Worth picking up if you want equipment you can rely on to keep both ends of your humidity range under control.
