I'm giving it 4 stars because it's not really portable. It requires a 110V power supply. It would be nice if it was powered by 12V, like other Bougerv products. The weight is reasonable. It cools very efficiently. But to be as efficient as possible, you need to vent the heat produced in cooling mode. The tube setting helps, but other modifications need to be made. Overall, it is a good option to cool down a RV or boat.