The above links quickly take you to the cooling method groups.  The descriptions of these groups appears below, also with links to the groups..

Wine coolers use one of several cooling technologies:

• Traditional Technology - the same as used in your kitchen refrigerator
• Thermoelectric - a more modern technology, which uses less electricity, operates quieter, has only one moving part, a fan, and has much less vibration than the traditional technology
• Hybrid - is a combination of the traditional and thermoelectric technologies
• Thermosiphon heat pump - a varient of the thermoelectric technology

Unless you are highly sensitive to the operating efficiency or the noise and vibration, we suggest you make your choice of wine cooler based on capacity, appearance and price.