Automatic gutter ice controllers include the GIT®-1 gutter ice sensor to detect and melt snow and ice from roofs, gutters and downspouts. The dual-action GIT-1 sensor detects both moisture and temperature, so the heaters run only when moisture is detected at or below 38.F (3.3.C). The built-in, fixed, 3-hour Hold-On Timer provides for a heating cycle long enough to fully melt snow and ice and keep them from refreezing. The Heater Cycle toggle switch allows manual activation or cancelation of heater operation. The included GIT-1 gutter ice sensor detects ice and snow as moisture at or below 38.F (3.3.C), so the RM-4 system could save hundreds of dollars a year compared to using just a simple thermostat alone to control the system.