The Amana-Goodman OT18-60A Outdoor Thermostat/Heat Pump is an essential component for keeping your Amana-Goodman split or packaged heat pump system running at peak efficiency. As a safety measure, this single pole double throw mechanism keeps the outside unit from working in extremely cold temperatures, which range from 0°F to 45°F. https://www.partshnc.com/outdoor-thermostatht-pump-3