Self contained cooling units are designed and used to provide a subtle temperature between 50~65 °F for a properly insulated wine cabinet. The refrigerated space will maintain humidity range within 50~70% RH. These temperature and humidity ranges are optimized for long term storage of wine. Temperature is controlled and humidity is adjusted using patented technology. Bottom cold-air supply is optimized for use in the wine cabinets. Multiple options for top and rear hot air exhaust are convenient for installations. The unit is self-contained ready for easy installation and use.