Symphony’s air coolers are so nice.but the problem is high rates of air coolers.But the best part is you have to pay just once after that it saves the electrical power consumption.it can work with inveeter also. I use it with my inverter.The symphony’s air coolers are light in weight so I can move it from one place to another.I am not totally satisfied with it because in hot days it does makes me relief fom hot environment.