G.A.S Enviro V2 Fan Controller — Automated Temperature & Humidity Control for Grow Rooms
Best for: Growers who want hands-off climate control without WiFi headaches or premium pricing
Our thoughts
This is the controller we recommend to growers who want their environment sorted without faffing about with apps or connectivity issues. Does exactly what it should — maintains temperature and humidity automatically, controls your fans in real time, and lets you programme everything else you need. One of the most popular units on the market for a reason.
The G.A.S Enviro V2 is a fully automated climate controller that takes temperature and humidity management completely off your plate. It monitors your grow room environment continuously, adjusts your intake and extraction fan speeds in real time, and controls additional equipment — heaters, humidifiers, lights — all from a single point. No manual adjustments. No guesswork. Just stable conditions, day and night.
How it compares
This sits at the sweet spot between simplicity and control in the mid-range controller market.
- More comprehensive than single-function thermostats — controls fans, lights, heaters, humidifiers from one unit
- More stable than WiFi-enabled controllers — no connectivity issues or settings lost during power cuts
- Built-in fan balancer — controls intake and extraction together intelligently, not sold as a separate add-on
- Day and night programming — match your lighting cycle and save energy automatically
- Better value than enterprise-grade systems without losing core functionality
In short: everything a small-to-medium grow room needs, without the features you don't and the complications you can do without.
Usage guidance
The Enviro V2 handles your environment in real time. Here's how it works:
Temperature and humidity control
Set your target temperature and humidity range for day and night. The built-in sensors detect changes in your grow room and automatically adjust your intake and extraction fans to maintain those settings. Too hot — fans speed up. Too cold — they slow down. Humidity too high — extraction increases. Humidity too low — extraction backs off. All automatic, all the time.
Fan speed programming
You set minimum and maximum fan speeds for day and night, so the controller has guardrails. This means your fans won't spin to ridiculous speeds just because it's warmed up slightly, and they won't drop too low when it's cool. Better for equipment longevity, better for energy bills.
Multi-equipment control
Two fully programmable sockets let you control other equipment based on your environmental data. Run a heater on cold nights? Plug it in. Humidifier in winter? Same socket. The controller triggers them on and off to maintain your environment. Lights up to 1200w can also be controlled for scheduling.
Day and night cycling
Programme completely different settings for your lights-on and lights-off periods. Your grow room doesn't need the same conditions at night as during the day — the V2 handles that automatically when you switch your lights on and off.
For small-to-medium rooms
This controller is best suited to spaces running 2–4 fixtures (typically 600w–1200w total lighting), which covers most home and semi-commercial setups. If you're running serious lighting or growing through summer heat, this will prevent the temperature stress and humidity spikes that kill yields and invite mould.
Technical specifications
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Fan control: AC and EC fans (both intake and extraction)
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Intake fan output: 10A maximum, 2300W
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Extraction fan output: 10A maximum, 2300W
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Programmable socket 1: 10A maximum, 2300W (non-lighting equipment)
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Programmable socket 2: 10A maximum, 2300W (non-lighting equipment)
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Lighting control: Up to 1200W maximum per circuit (due to high start-up surge)
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Temperature sensor: Built-in calibration, day and night settings
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Humidity sensor: Built-in calibration, day and night settings
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Display: LCD screen with automatic dimming and green LED backlight (non-disruptive to plants)
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Data logging: Records temperature and humidity at regular intervals for performance tracking
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Day/night programming: Separate settings for temperature, humidity, minimum and maximum fan speeds
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Features: Plug-and-play design, built-in fan balancer, dump function for closed-loop environments
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Certification: CE certified
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Compatibility: Works with Systemair Revolution EC and AC fan range (and other standard AC/EC fans)
Who this is for
- Small-to-medium growers running 2–4 fixtures who want to automate their environment
- Anyone growing through summer or in naturally warm climates where temperature control is critical
- Growers who've had mould problems and need active humidity management
- Experienced growers looking for reliable, long-term equipment without paying for unnecessary complexity
- Anyone who doesn't want WiFi connectivity headaches — just solid, dependable hardware
- Growers running intake and extraction fans who want them balanced intelligently, not controlled separately
Particularly suited to setups where stability and simplicity matter more than mobile app monitoring.
Our take
This is one of the most popular controllers on the market for a reason — it does what it's supposed to do, reliably, without the drama. Temperature swings and humidity spikes are what damage crops and invite problems. The Enviro V2 prevents that by being awake 24/7 when you're not.
If you're tired of manually adjusting fans or worrying about your environment drifting, this controller will give you peace of mind and better results. Proper kit at a solid price, and genuinely worth picking up if you're running any serious lighting or growing in variable weather. Good time to buy while stock lasts.
