Self sealing couplings. (unit is precharged with refrigerant) Evaporator supplied with 12 ft line set. Efficient air cooled condenser, will provide years of simple reliable service in the tropics. Condenseris sized specifically to ensure capacity in the hottest of climates.Variable speed compressor. (adjusted by changing the resistance incontrol circuit) 18 GA powder coated steel with a compact foot print. Backed with Nova*Kool's Easy 2 Year Warranty Program on all components. Environmentally sound 134a refrigerant. Simple, efficient and reliable rollbond plate evaporators. Can in many cases be bent to conform to your requirements. Compressor designed to run continuously on a 30 degree heal. Low battery protection to help prevent full discharge of batteries. Low amperage fan. Voltage: 12 & 24V DC standard.