KEY FEATURES: Google’s smartest, most advanced thermostat yet, the Google Nest Learning Thermostat (4th gen) is a beautiful, brilliant way to save energy, keep your home comfortable, and help make sure your heating and cooling systems are running smoothly The Nest Learning Thermostat (4th gen) works with most 24V systems, including gas, electric, oil, forced air, heat pump, and radiant, and no C wire is required for installation in most homes; visit the Nest Compatibility Checker for more info...