The ET series two position room thermostat are wall mounted line voltage thermostats suitable for direct connection with any resistance heating elements and unit heaters. This thermostat has a snap action switch operated by a bimetal actuator and is available in single pole, double pole with positive off, two stage heat. Cooling only and heat or cool models. Thermometer comes as standard on all models. Standard temperature range is 50 to 90 deg F (35 to 75 deg F available on certain models).