An automatic control system for gutters and downspouts, employs one or more GIT-1 Gutter Ice Sensors and an EUR-5, APS-3C or APS-4C Control Panel. Heaters operate only while required thus saving energy and ensuring reliable ice melting. Since the GIT-1 mounts in gutters and downspouts it senses actual environmental conditions. This im-proves sensing accuracy. Solid state moisture and temperature sensors provide the sensitiv-ity required for effective automatic control.