Most car refrigerators avoid using compressors because traditional compressor systems are relatively large, heavy, expensive, and consume more power - making them less ideal for vehicles where space and energy efficiency are crucial. Instead, many car refrigerators use thermoelectric (Peltier) cooling technology, which is lighter, cheaper, quieter, and easier to maintain. Although thermoelectric coolers are generally less powerful and less efficient than compressor-based systems (especially in very hot environments), they are sufficient for the moderate cooling needs typically required inside a vehicle.
However, it's worth noting that some high-end or heavy-duty car refrigerators do use compact, specially designed compressors (like Danfoss/Secop compressors) to offer true refrigeration or even freezing capabilities, especially for serious outdoor or off-grid use.
