The Cli-Mate Frequency Controller is a stand‑alone, plug‑and‑play digital controller for AC fan speed, designed to stabilize room temperature while keeping motors humming- and vibration‑free. It includes a temperature sensor and offers two modes: Auto, which regulates speed to a user setpoint with adjustable hysteresis, and Manual, which sets a fixed operating frequency. A large LCD provides clear access to settings for minimum and maximum fan speed, temperature units, and bandwidth. Available in 3 A, 7 A, and 15 A versions, it features a temperature range of 5–55 °C, frequency output of 5–50 Hz, 1 °C switching differential, IP44 protection, and 220/230 V 50 Hz supply. Dimensions are 170 × 210 × 120 mm, and a metal mounting plate is included.