Updated for 2026 — This article has been reviewed and updated with the latest recommendations.
12 Best Temperature and Humidity Controllers for Grow Room in 2026
Cannabis plants have specific temperature and humidity requirements at each stage of growth. Seedlings want high humidity and moderate warmth. Vegetative plants thrive at 70-85F with 40-60% relative humidity. Flowering plants need lower humidity (35-50%) to prevent mold and bud rot. Maintaining these conditions manually is exhausting and unreliable. An environmental controller automates the process, monitoring conditions and turning equipment on and off to keep things dialed in.
Here are the best temperature and humidity controllers for grow rooms in 2026.
Best Grow Room Controllers Compared
| Product | Controls | Outlets | App Control | Best For | Price |
|---|---|---|---|---|---|
| AC Infinity Controller 69 Pro+ | Temp + humidity | 4 outlets | Yes (WiFi) | Overall best | $75-95 |
| Inkbird ITC-608T | Temp + humidity | 2 outlets | No | Budget option | $40-55 |
| AC Infinity Controller 67 | Temp + humidity | 2 outlets | No | Simple automation | $35-45 |
| TrolMaster Hydro-X Pro | Full environment | Multiple zones | Yes (WiFi) | Commercial grows | $300-400 |
| Niwa Grow Hub | Temp + humidity + light | 4 outlets | Yes (WiFi) | Smart grow automation | $150-200 |
| VIVOSUN GrowHub E42A | Temp + humidity | 4 outlets | Yes (Bluetooth) | VIVOSUN ecosystem | $60-80 |
| Inkbird IHC-200 | Humidity only | 2 outlets | No | Dedicated humidity control | $30-40 |
| BN-Link Digital Temp Controller | Temp only | 2 outlets | No | Budget temp control | $18-25 |
1.
AC Infinity Controller 69 Pro+
AC Infinity dominates the home grow market for environmental controls, and the Controller 69 Pro+ is their flagship. It monitors temperature and humidity via a wired probe, then automatically controls up to 4 outlet-connected devices based on your programmed thresholds. Connect your exhaust fan, humidifier, dehumidifier, and heater, and the controller manages everything.
The WiFi app lets you monitor conditions and adjust settings remotely. You get alerts if temperature or humidity goes out of range, which is invaluable during heat waves or equipment failures. The backlit display shows real-time conditions at a glance.
At $75-95, it is the sweet spot of capability and price. It integrates seamlessly with AC Infinity's popular inline fans and other products but works with any device you plug into its outlets.
2.
Inkbird ITC-608T
Inkbird makes reliable, no-frills controllers at budget prices. The ITC-608T handles both temperature and humidity with two outlet pairs: one set turns on when conditions go above your threshold (exhaust fan, dehumidifier) and the other turns on when conditions drop below (heater, humidifier). The dual-probe sensor measures both temp and humidity simultaneously.
There is no app or WiFi.
You set your thresholds using the buttons on the front panel and the controller handles the rest. At $40-55, it is the best budget option that controls both temperature and humidity in a single unit.
3. AC Infinity Controller 67
The Controller 67 is AC Infinity's entry-level model.
It offers the same temperature and humidity monitoring as the 69 Pro+ but with just 2 outlets and no WiFi connectivity. It is a straightforward plug-and-play controller that excels at simple setups where you just need an exhaust fan to kick on when conditions warrant it.
At $35-45, it is the cheapest AC Infinity controller and a solid choice for small tents with minimal equipment to automate.
4.
TrolMaster Hydro-X Pro
TrolMaster is the commercial standard for grow room environmental control. The Hydro-X Pro manages temperature, humidity, CO2, lighting schedules, irrigation, and more across multiple zones. It supports dozens of connected devices and provides detailed data logging and analytics through its app.
At $300-400 for the base controller (additional sensors and modules sold separately), this is overkill for a single tent but essential for anyone running a multi-room or commercial operation. The modular design means you can start small and add capabilities as your grow scales up.
5. Niwa Grow Hub
Niwa takes a smart-home approach to grow room control. The Grow Hub connects to WiFi and provides an intuitive app with grow recipes, data logging, and automated environmental management. It controls temperature, humidity, and lighting through 4 smart outlets.
The app includes pre-built profiles for different plant types and growth stages, which is helpful for beginners who are not sure what conditions to target. At $150-200, it sits between the AC Infinity and TrolMaster in both price and capability.
Setting Up Your Environmental Control
Place your temperature and humidity sensor at canopy height, shielded from direct light and airflow from fans. These factors skew readings. Program your controller with the following general targets: vegetative stage at 70-80F and 50-65% humidity; early flower at 68-78F and 45-55% humidity; late flower at 65-75F and 35-45% humidity. Set a temperature differential of at least 2-3 degrees between on and off thresholds to prevent equipment from cycling on and off rapidly. And always have your controller manage the exhaust fan as priority one, since proper ventilation solves most temperature and humidity problems simultaneously.
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Humidity ControllersTemperature Growing
