The first cooling systems for food involved using ice. Artificial refrigeration began in the mid-1750s, and developed in the early 1800s. In 1834, the first working vapor-compression refrigeration system was built. The first commercial ice-making machine was invented in 1854. In 1913, refrigerators for home use were invented. In 1923 Frigidaire introduced the first self-contained unit. The introduction of Freon in the 1920s expanded the refrigerator market during the 1930s. Home freezers as separate compartments (larger than necessary just for ice cubes) were introduced in 1940. Just like you occasionally clean out your refrigerator, you also need to clean out your freezer. If you live in a cold climate, it's easy to do this in the winter: just put all your frozen items on the porch while you clean and sort. Also like the refrigerator and other appliances, freezers need some regular maintenance and checkups. Check the gaskets and seals and replace them if needed. Name: M. Naeem mob# 0543496216