The trivalent refrigerators of the caravans work at 12 V when the caravan is plugged into the car's socket or to an external battery such as the mover, at 220 V when the caravan is externally connected to a 220 V socket or at gas when not they are operating at neither of the two energy streams above. These refrigerators do not have a compressor like the ones at home, they use an absorption peltier plate and when it is very hot (which is when they are most needed), they cost more to cool. To improve the cold in your fridge, we installed two micro-fans in the exchanger, which greatly improves its operation by helping this peltier plate to dissipate heat with greater speed and achieving greater cold.