The invention is an article vending machine comprising a plurality of article storage compartments covered by displaceable thermal barriers that are opened by an opener. The invention further comprises a cooling unit, an article extractor for extracting selected articles from the storage compartments, and a control center. Each article storage compartment has a displaceable thermal barrier that is opened and closed by an opener. Each displaceable thermal barrier is capable of being opened and closed independently of all other displaceable thermal barriers. During the vending cycle, only the displaceable thermal barrier covering the storage compartment accessed by the article extractor is opened, which prevents ambient air from mixing with cooled air in storage compartments not accessed by the article extractor. If a displaceable thermal barrier cannot be opened because it has frozen shut or the opener has broken, the remaining displaceable thermal barriers with functioning openers still can be opened.