Air conditioning
Cooling as a tool to enhance the usefulness of the food or provide us with comfort, known for hundreds of years. In the early days, the cooling was a luxury available only to the privileged and was obtained, mainly, by naturally-pro-duced ice. In winter the ice of the lake and ponds was cut and store in isolated storage room for summer use. The majority of natural ice was used for storage of food products in shops, restaurants and homes. Just before the end of the 19th century, "man-made" ice appeared. The first mechanical, household refrigerators were sold around 1910. Since then, refrigerators and freezers, moved from luxury items to the first necessity. Today, almost every house has one or more.
The term air conditioning, as you know, includes several methods of air conditioning. Now we will focus only on cooling aspect of air conditioning. In this sense, air-cooling. Although modern air conditioning was developed prior to 1940, it is becoming increasingly popular in theaters, offices and cars in the 1950s. More and more people accustomed to air-conditioned offices and cars, and naturally they want air conditioning in their homes. Today in the USA, more than 70% of homes have air conditioning, while in warmer areas, this figure exceeds 90%.
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Refrigeration