A line voltage cooling thermostat is a device that regulates the temperature of a cooling system by sensing the temperature of the air and then turning the cooling system on or off accordingly. It is usually installed in the return air duct of a cooling system, and it works by sensing the temperature of the air and then activating the cooling system when the temperature exceeds a certain threshold. The thermostat is typically connected to a control panel that allows the user to set the desired temperature, as well as the time of day when the cooling system should be turned on or off. The thermostat is designed to maintain a comfortable temperature in the home or office, while also saving energy by not running the cooling system unnecessarily. Line voltage cooling thermostats are an essential part of any cooling system, as they ensure that the temperature remains at a comfortable level, while also helping to reduce energy costs.