Best Environment Controllers for Grow Rooms: 2026 Buying Guide
Most tents only need a fan speed controller with a temperature probe, such as the Mission Control LogicFan. Step up to a climate controller when humidity is the problem too. Choose a smart hub only if you will buy that brand’s fans, lights and climate kit, because it runs nothing else.
The best grow room controllers
Mission Control LogicFan 6.5A
£38.95
The simplest way to stop an extractor running flat out. The temperature probe comes fitted, so it works straight from the box.
- One fan, up to 6.5A
- 3m probe fitted
- Auto or manual mode
- 2-year warranty
- Speed changes ramp smoothly and quietly, with no sudden jumps
- Built-in plug leaves the next socket free
Know before you buyIt answers temperature only. If your tent goes damp at lights-off, you need a climate controller.
View Mission Control LogicFan 6.5A
G.A.S Enviro Controller V2
£274.49
Full temperature and humidity control of intake and extraction. It runs AC and EC fans, so you are not tied to one fan brand.
- Intake and extraction
- 2 extra sockets
- AC and EC fans
- 13A total
- Separate day and night settings for temperature and humidity
- Sockets for a heater, humidifier or dehumidifier
- Calibratable probe on a 3.8m lead
Know before you buyThe dearest here. Keep everything you plug into it within 13A in total.
View G.A.S Enviro Controller V2
Rhino 2EC + RH
£128.99
Runs a Rhino EC intake and extractor together and holds the tent at negative pressure, so the walls stay put and air keeps moving through the filter.
- Two EC fans
- Temperature, humidity, light
- Day and night settings
- RJ45 sensor lead
- Balances the two fans to within 1% of speed
- Under half the price of the G.A.S
Know before you buyRhino list their own Ultra Silenced, Non-Silenced and Mixed Flow EC fans as compatible. If yours are another brand, check before you buy.
View Rhino 2EC + RH
AC Infinity Controller 69 PRO
£90.49
Runs up to four AC Infinity fans, humidifiers or heaters from one screen and your phone, with a VPD mode that ties temperature and humidity together.
- Up to 4 devices
- 7 modes, including VPD
- Wi-Fi app
- 3.7m probe
- Timer, cycle, schedule and trigger modes as well
- Powered by the device it runs, so no extra plug
Know before you buyIt only controls AC Infinity UIS devices.
View AC Infinity Controller 69 PRO
VIVOSUN GrowHub E42A
£87.95
Lights, fans and climate in one VIVOSUN app, with temperature, humidity and VPD on the screen.
- Up to 12 AeroLights
- Up to 4 fans
- Temperature, humidity, VPD
- Wi-Fi app
- Runs grow lights as well as fans
- Reads an onboard sensor and a 3m probe
- Timer, cycle and schedule modes
Know before you buyIt is built around VIVOSUN lights and fans, and takes its power from a linked VIVOSUN device or an optional 12V adaptor.
View VIVOSUN GrowHub E42A
Maxibright Universal Lighting Controller
£98.95
Set the schedule and power once and every 0–10V dimmable light follows, with sunrise and sunset ramps.
- Any 0–10V dimmable light
- Sunrise and sunset
- Heat cut-back
- Temperature and humidity display
- Every light kept in step from one unit
- Dims or switches lights off if the room runs over a set temperature
Know before you buyYour light needs a 0–10V dimming input. Maxibright name their Varidrive and Gorilla LED ranges as compatible.
View the Maxibright controller
Global Air Day & Night Controller
From £74.49
Two dials, no menus. It switches a heater, humidifier or dehumidifier between your day and night settings as the lights go on and off.
- Up to 2kW
- Light probe
- Two dials
- No screen
- Heater version £79.49, holds 10–40°C
- Humidifier version £89.49, holds 20–90% RH
- Dehumidifier version £74.49
Know before you buyEach version runs one type of device, and there is no display. Pair it with a thermo-hygrometer to see what the tent is doing.
View the Global Air controllerCompared
Pick by the job first. Only the smart hubs have an app.
| Controller | Best for | Runs | App | Price |
|---|---|---|---|---|
 Mission Control LogicFan 6.5A |
Heat | 1 fan | No | £38.95 |
 G.A.S Enviro Controller V2 |
Heat and damp | 2 fans, 2 sockets | No | £274.49 |
 Rhino 2EC + RH |
Rhino EC fans | 2 EC fans | No | £128.99 |
 AC Infinity Controller 69 PRO |
AC Infinity | 4 devices | Yes | £90.49 |
 VIVOSUN GrowHub E42A |
VIVOSUN | Lights, 4 fans | Yes | £87.95 |
 Maxibright Lighting Controller |
LED lights | 0–10V lights | No | £98.95 |
 Global Air Day & Night Controller |
Cold, damp nights | 1 device | No | From £74.49 |
Prices as at October 2026.
How to choose
- Name the problem first. Too hot: a fan speed controller. Damp at lights-off: a climate controller. Cold at night: a day and night heater controller.
- Check your fan type. Plug-in speed controllers suit AC fans. EC fans need an EC controller that lists them.
- Choose a hub only if you want the system. Smart hubs run their own brand’s devices and nothing else.
- Add up the load. Total the amps or watts of everything plugged in and stay inside the rating.
- Put the sensor at canopy height, out of direct light and away from the fan’s airflow.
For the right temperature and humidity at each stage, see our humidity guide; for the fan itself, our best quiet inline fans.
Quick answers
Do I need a fan controller for my grow tent?
Almost always. A fan running flat out is loud, wastes electricity and can leave the tent too cold and dry at lights-off. A controller with a temperature probe slows it when the tent is cool and speeds it up as it warms.
What is the difference between a fan controller and a climate controller?
A fan controller adjusts one fan, usually by temperature. A climate controller reads temperature and humidity together and runs intake and extraction, often with sockets for a heater or humidifier and separate day and night settings.
Can I use any fan controller with an EC fan?
No. EC fans take a low-voltage control signal, so a plug-in AC speed controller is the wrong tool. Use the EC controller made for your fan, or one that lists it, such as the G.A.S Enviro Controller V2.
What is VPD mode on a controller?
VPD, or vapour pressure deficit, combines temperature and humidity into one number for how strongly plants draw water. In VPD mode, a controller adjusts fans or humidifiers to hold that number.
Free Express Delivery over £99 to UK mainland addresses, arriving in 1–2 working days when you order by 3pm Monday to Friday. Or collect from our Wembley store at 250 Water Road, Wembley, London HA0 1HX (Mon–Fri 10:00–18:00, Sat 10:00–17:00).
Questions? Call 020 3488 0419 or WhatsApp 07440 524620 for free advice.
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