... 4.No thermostat need 5.Power:<3500W PTC heating element with fan heater 1.maintain automated temperature control and power ... and welding could be used in air-conditioners, drier, dryer, warm air generator, and air-conditioner for both warm, and cold ... specifications are available Application: Air condition heater, humidifier,de-humidifier,car's heater,air heater,dryer ,fan heater and so on