G.A.S Enviro4 Controller - Four-Socket Environmental Control for Fans, Heaters and Humidity
Best for: growers who want one controller to manage EC fan speed plus up to four other pieces of equipment - heaters, humidifiers, dehumidifiers or lights - on programmable schedules.
Our thoughts
The Enviro4 is the controller to reach for once you're tired of juggling separate timers and thermostats for every piece of kit in the room. Doubling the Enviro V2's power handling to 26 amps across four sockets means it can genuinely run a full room setup, not just the fans. It's a bigger investment than a single fan controller, and it's meant to be - this replaces several separate devices, not one.
The G.A.S Enviro4 Controller is a full grow room environment controller from Global Air Supplies, built as the successor to the Enviro Controller V2. It combines EC fan speed control with four programmable sockets that can switch practically any other piece of equipment in your room on and off - heaters, humidifiers, dehumidifiers, extra lighting.
Each of the four sockets can handle up to 2,200 watts, with the sockets together rated to 26 amps - twice the capacity of the previous Enviro V2. Because grow lights draw a high start-up surge, G.A.S recommends keeping total lighting load across all four sockets under 2,400 watts rather than running them at the individual socket limit simultaneously. A thermostat and humidity sensor drive automatic regulation, with separate day and night settings so your room's target temperature and humidity can shift with your light cycle. The external temperature probe connects via a socket on the case, so it can be swapped out if it's ever damaged rather than needing the whole unit replaced.
How it compares
The Enviro4 sits in the multi-device environmental controller category alongside more expensive app-connected systems.
- Versus its predecessor, the G.A.S Enviro V2: the Enviro4 doubles rated socket capacity from 13A to 26A.
- Versus TrolMaster's Hydro-X system: TrolMaster offers app and Bluetooth/WiFi connectivity with modular sensor add-ons at a considerably higher entry cost; the Enviro4 keeps control local and hands-on at a lower price.
- Versus running separate single-purpose controllers (a fan speed controller plus a humidity controller plus a plug timer): the Enviro4 consolidates all of that into one unit with shared day/night logic.
You're paying more than a single fan controller, but you're replacing several separate devices with one that talks to itself.
Usage guidance
The Enviro4 is designed to sit at the centre of your room's environmental control.
Fan speed control
Connect your EC fans and set your thermostatic targets the same way as G.A.S's dedicated EC controllers.
Socket programming
Plug heaters, humidifiers, dehumidifiers or lighting into the four sockets and set day/night behaviour for each based on your temperature and humidity targets.
Probe placement
Position the temperature and humidity probe centrally in the canopy area, away from direct light or airflow, for accurate readings.
Load management
Keep total connected lighting load across all four sockets under 2,400 watts to account for start-up surge, even though individual sockets are rated to 2,200 watts each.
Technical specifications
- Manufacturer: Global Air Supplies (G.A.S UK)
- Programmable sockets: 4
- Combined socket rating: Up to 26 amps
- Per-socket rating: Up to 2,200 watts
- Recommended lighting load limit: Under 2,400 watts total across all sockets
- Sensors: Thermostat and humidity sensor with replaceable external probe
- Fan control: EC fan speed control included
- Scheduling: Separate day and night settings
Who this is for
- Growers running multiple pieces of environmental equipment who want one central controller
- Anyone stepping up from separate single-purpose fan and humidity controllers
- Rooms needing day/night switching across fans, heaters and humidity equipment together
Best suited to established grow rooms with several devices to coordinate, rather than a simple single-fan tent.
Our take
The Enviro4 earns its place as a step-up purchase - it's not for someone with a single fan and nothing else to control, but for a room with a heater, a humidifier and lighting to coordinate, replacing four separate timers and thermostats with one unit is genuinely worth the outlay.
Particularly well suited to new growers building out a full room rather than a basic tent. Worth picking up if you want equipment you can rely on.
