Garden Controls Fan Controller is an electronic fan controller and ventilation controller for maintaining stable room temperature by adjusting fan speed as conditions change through day and night. Designed as a fan speed controller with day/night setting control, it gives you easy day and night settings so the room can run to a daytime target and a nighttime target without constant manual tweaks. That day/night setting focus helps keep temperature management consistent when lights, heat load, and ambient conditions shift between day and night periods. Instead of simple on/off cycling, it’s built around stable room temperature with fan speed control, keeping airflow responsive rather than abrupt. Accuracy is a core feature of this controller. It uses accurate electronic control with an external sensor, helping the system react to real room conditions instead of relying on guesswork or fan-only timers. The external sensor design supports precise temperature-based fan control in grow rooms and indoor garden spaces where consistent airflow and temperature stability matter for overall plant performance and reduced environmental stress. The control logic also includes idle on/off functionality, giving the controller a practical way to manage how the fan behaves around set points. This helps maintain a steadier climate profile while still allowing the fan to respond when the room drifts away from your target. Alongside that, a safety low temperature limit adds an extra layer of protection for cooler conditions, helping prevent the space from being driven too cold by ventilation when temperatures drop overnight or during seasonal changes. Garden Controls Fan Controller is built for common indoor ventilation setups and is rated at 120V, 5A, 600W. That electrical rating supports many typical fan-control applications where reliable, repeatable temperature management is the goal. The product is purpose-built as a temperature fan controller, keeping the experience focused on what shoppers want most from this category: dependable fan speed control, steady room conditions, and simple day/night operation without complicated programming. This is a good fit for growers who want a straightforward fan controller for indoor ventilation control, especially when the goal is stable room temperature, day/night set point control, and an external sensor-driven approach with a safety low temperature limit for more dependable climate stability. Specifications: Operation Settings: Day / Night; Sensor Corded: Temperature; Input Voltage: 120 Volts; Maximum Wattage: 600 Watt; Maximum Ampage: 5 A.