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People needed to keep perishable food on low temperatures before the refrigerator appeared as well as today. As a source of cold in the wormer months they used ice from lakes and rivers stored in ice houses during the winter. Read more about history of ice houses.
Fridges and their stronger and colder cousins - freezers are today required equipment in every home. But it was not always like that. They ancestors were much simpler and not too practical. Find out more about fridges history.
Refrigeration is one of the main food storage techniques in developed countries. But it was not always so. To keep our food cool we had to harvest ice from the nature itself. Today almost every household has a refrigerator. Read about refrigerator history.
Although it looks like a new invention idea of a solar-powered refrigerator is relatively old and pretty simple - to use heat of the sun instead of the compressor in the refrigerator to liquefy the refrigerant. Read more about solar-powered refrigerators.