A line thermostat is a device used to regulate temperature in a given space. It is a type of thermostat that is connected directly to the power line and can be used to control a variety of appliances, such as air conditioners, heaters, and refrigerators. Line thermostats are typically used in commercial and industrial settings, as they are more reliable and efficient than other types of thermostats. Line thermostats work by sensing the temperature in the room and then sending a signal to the appliance to turn on or off accordingly. This allows for precise temperature control, as the thermostat can be adjusted to maintain a certain temperature. Line thermostats are also more energy efficient than other types of thermostats, as they do not require any additional energy to operate. This makes them a great choice for businesses that want to save money on their energy bills.