G.A.S AC-EC Controller - One Controller for Both AC and EC Duct Fans
Best for: growers who want a single controller that regulates intake and extraction by both temperature and humidity, and works with either AC or EC fans.
Our thoughts
What makes the AC-EC genuinely useful is that it doesn't care which fan technology you're running - it handles AC and EC duct fans through the same two sockets. Add humidity-based control and separate day/night settings on top of temperature, and it covers more ground than most single-purpose fan controllers without stepping up to a full multi-socket environmental controller.
The G.A.S AC-EC Controller is a digital fan controller built to get the best out of any duct fan, whether it's a standard AC motor or a more sophisticated EC digital motor. It provides two sockets rated at 5 amps each - one for intake, one for extraction - and regulates fan speed according to both temperature and humidity readings, rather than temperature alone.
Separate day and night settings are available for temperature, humidity and your minimum/maximum fan speeds, so your room's targets can shift automatically with your light cycle. A built-in fan balancer lets you set accurate negative pressure between intake and outtake, and a light sensor built into the probe detects your lighting schedule automatically, so you don't need to manually program day/night switching times.
How it compares
The AC-EC's main advantage is fan-type flexibility combined with humidity-based control.
- Versus G.A.S's EC-only controllers (EC, EC1, EC2, EC5): those are built specifically for EC fans; the AC-EC works with AC or EC duct fans through the same unit.
- Versus a basic AC1 or EC1 thermostatic controller: those regulate on temperature alone; the AC-EC also factors in humidity, with separate day/night targets for both.
- Versus TrolMaster's Hydro-X system: TrolMaster adds app connectivity and modular sensors at a considerably higher price; the AC-EC keeps humidity-aware dual-fan control simple and self-contained.
For growers who don't want to commit to one fan technology or one control variable, the AC-EC covers both without the cost of a full environmental system.
Usage guidance
The AC-EC is designed for straightforward installation regardless of fan type.
Installation
Connect your intake and extraction fans to the two 5A sockets - AC or EC fans are both supported.
Setting targets
Program your temperature and humidity targets, with separate settings for day and night if needed.
Balancing
Use the built-in balancer to set negative pressure between your intake and outtake fans.
Lighting detection
The probe's built-in light sensor detects your day/night lighting schedule automatically, so no manual timer programming is required for day/night switching.
Technical specifications
- Control type: Digital dual-fan controller, temperature and humidity based
- Manufacturer: Global Air Supplies (G.A.S UK)
- Sockets: 2, rated 5 amps each (intake and extraction)
- Fan compatibility: AC and EC duct fans
- Scheduling: Separate day and night settings for temperature, humidity and fan speed
- Balancing: Built-in fan balancer for negative pressure
- Light detection: Automatic via light sensor in the probe
Who this is for
- Growers with a mix of AC and EC fans who want one controller for both
- Anyone who wants humidity-based fan regulation, not just temperature
- Growers who want automatic day/night switching without manually programming a timer
Best suited to growers running a genuine intake/extraction pair who want more than basic thermostatic control.
Our take
The AC-EC does more than most single-purpose controllers for a sensible step up in price - fan-type flexibility, humidity awareness, and automatic day/night detection all in one unit. It's one we sell a lot of for new growers who aren't sure yet whether they'll end up on AC or EC fans.
If you want a controller that won't box you into one fan technology, this is proper kit at a price that makes sense.
