A fan controller is an essential accessory for indoor growers who want to precisely regulate temperature and humidity in their grow tent or grow room. With a good controller you automatically adjust your fans' output to ambient conditions, keeping the climate stable at all times. This is crucial for healthy plant growth and high yields.
A fan controller adjusts the speed of your extraction and intake fans to the temperature in your tent, so they run hard when it's warm and slow down when it's cool. This collection includes Inqontrol STC temperature controllers in 8A, 16A and 32A, the STC Twinmaster 14A and Buddy 16A, SMSCOM SPC controllers, slaves and twin controllers, Dutch Masters DM-1000 and DM-1500 with thermostat, the Platinum EC controller and an SMSCOM temperature sensor. Check that the controller suits your fan type (AC or EC) and can handle its current, and whether you want to control one fan or extraction and intake together. Read our guide to fan controllers for grow rooms, and find fans in extraction fans and inline fans.
Questions & answers about Fan Controllers
All growing questions →- Ventilation & odour Do I need a speed controller for my exhaust fan? Yes, I'd get one. A fan at full speed is usually louder and pulls more air than the tent needs. Read the answer →
- Ventilation & odour How do I make my grow tent fan quieter? Turn it down with a speed controller, hang it so it doesn't touch anything, and keep the ducting straight. Read the answer →
- Ventilation & odour What fan size (m³/h or CFM) do I need for my grow tent? Work out the tent volume (width x depth x height in m³) and pick a fan that can move at least that much air per minute, so roughly 170 m³... Read the answer →
- Ventilation & odour Why are my grow tent walls sucked inwards? Your fan is pulling out more air than the intakes let in. A little suction is good for odour, but if the walls are bowing in, the fan is ... Read the answer →
Why a Fan Controller Is So Important in Indoor Growing
Climate plays a central role in indoor cultivation. Excessive temperatures or the wrong humidity can inhibit growth, encourage pests or cause mold. A fan controller offers clear advantages here:
Automatic regulation: fans only run as hard as necessary. Optimal climate: temperature and humidity stay within the ideal range. Save energy: lower power consumption through demand-based control. Longer lifespan: fans are spared and run more quietly.
Especially combined with a carbon filter, a fan controller ensures reliable odor control and a consistent environment.
Types of Fan Controllers
Depending on your needs and grow setup, there are various models:
Manual fan controllers: simple dials to manually adjust fan speed. Automatic fan controllers: with built-in sensors that measure temperature and humidity and adjust the fan automatically. Digital controllers: modern systems with a display, often with extra functions such as min/max memory or programmable settings. Multi-channel controllers: control several fans or even heaters and humidifiers at the same time – perfect for more complex setups.
Tips for Choosing the Right Fan Controller
Consider tent size: the larger your grow tent, the stronger the fans – and the more important precise control becomes. Check compatibility: make sure the controller matches your fans (power & connections). Extra features: digital displays, programmable timers or night-time dimming can make growing noticeably easier.
Buy Fan Controllers for Indoor Growing
A fan controller is the best way to maintain a constant, healthy climate in your grow tent or grow room. Whether a simple manual controller or a digital unit – with the right technology you give your plants the ideal conditions for growth and flowering.
