12V DC RV Caravan Truck Excavator Universal Car Truck Air Conditioner Kit. The outdoor unit should be able to run normally 24 hours a day, 365 days a year under the conditions of ambient temperature -15. 90%, sun and rain. Cooling is possible at this ambient temperature. The main functions cover refrigeration, heating, ventilation and air purification, etc. The main components include compressors, condensers, liquid receivers, expansion valves, evaporators, fans and pipelines. Its working principle is: the refrigerant circulates under the action of the compressor, and the condenser in the engine compartment is liquefied from a gaseous state to a liquid state, releasing heat; while in the car, it evaporates from a liquid state to a gaseous state, absorbing heat, thereby reducing the temperature inside the car. The product has been tested in the harsh environment of -28/-10. The product runs normally, and no protection action occur. And it is suitable for the climate in the north and south of United States of America. Telligent inverter scroll compressor, more powerful and cooling faster. Special surface treatment, corrosion resistance, larger heat dissipation area, better refrigeration effect. 360 full waterproof electronic Fan. Better heat dissipation effect. Square wave controller with 21 aluminum case. Intelligent frequency conversion controller. Two types of installation of the. Machine, vertical hang-up, support for horizontal installation. Specification of power cord. Size of internal machine. (Except some countries and APO/FPO). The images shown are not the actual item and are for your reference only. Is provided by the carrier and excludes weekends and holidays. Transit times may vary, particularly during the holiday season. International buyers please note. For all orders, please note that. There Are NO EXCEPTIONS! (If you request a return, please send evidence of the defect of the product). We will be happy to serve you. OUR WORKING Time(Beijing): 9:00am6:00pm(MondayFriday). 1 or 2 Star DSR Ratings Destroy Our Company.