Editing Refrigeration (section)

===Home and consumer use===
[[File:Early household refrigerator in Popular Science 1919.png|thumb|An early example of the [[consumerization]] of mechanical refrigeration that began in the early 20th century. The [[refrigerant]] was [[sulfur dioxide]].]]
[[File:Food into a refrigerator - 20111002.jpg|thumb|A modern home refrigerator]]

During the early 1800s, consumers preserved their food by storing food and ice purchased from ice harvesters in iceboxes. In 1803, Thomas Moore patented a metal-lined butter-storage tub which became the prototype for most iceboxes. These iceboxes were used until nearly 1910 and the technology did not progress. In fact, consumers that used the icebox in 1910 faced the same challenge of a moldy and stinky icebox that consumers had in the early 1800s.<ref>{{cite book|last=Freidberg|first=Susanne|title=Fresh: a perishable history|year=2010|publisher=Belknap|location=Cambridge, MA|isbn=978-0-674-05722-7|pages=23, 38|edition=1st Harvard University Press pbk.}}</ref>

General Electric (GE) was one of the first companies to overcome these challenges. In 1911, GE released a household refrigeration unit that was powered by gas. The use of gas eliminated the need for an electric compressor motor and decreased the size of the refrigerator. However, electric companies that were customers of GE did not benefit from a gas-powered unit. Thus, GE invested in developing an electric model. In 1927, GE released the Monitor Top, the first refrigerator to run on electricity.<ref>{{cite book|last=Freidberg|first=Susanne|title=Fresh: a perishable history|year=2010|publisher=Belknap|location=Cambridge, MA|isbn=978-0-674-05722-7|pages=43–45|edition=1st Harvard University Press pbk.}}</ref>

In 1930, Frigidaire, one of GE's main competitors, synthesized [[Freon]].<ref>{{cite book|last=Freidberg|first=Susanne|title=Fresh: a perishable history|year=2010|publisher=Belknap|location=Cambridge, MA|isbn=978-0-674-05722-7|pages=44|edition=1st Harvard University Press pbk.}}</ref> With the invention of synthetic refrigerants based mostly on a [[chlorofluorocarbon]] (CFC) chemical, safer refrigerators were possible for home and consumer use. Freon led to the development of smaller, lighter, and cheaper refrigerators. The average price of a refrigerator dropped from $275 to $154 with the synthesis of Freon. This lower price allowed ownership of refrigerators in American households to exceed 50% by 1940.<ref>{{cite book|last=Freidberg|first=Susanne|title=Fresh: a perishable history|year=2010|publisher=Belknap|location=Cambridge, MA|isbn=978-0-674-05722-7|pages=45|edition=1st Harvard University Press pbk.}}</ref> Freon is a trademark of the DuPont Corporation and refers to these CFCs, and later hydro chlorofluorocarbon (HCFC) and hydro fluorocarbon (HFC), refrigerants developed in the late 1920s. These refrigerants were considered — at the time — to be less harmful than the commonly-used refrigerants of the time, including methyl formate, ammonia, methyl chloride, and sulfur dioxide. The intent was to provide refrigeration equipment for home use without danger. These CFC refrigerants answered that need. In the 1970s, though, the compounds were found to be reacting with atmospheric ozone, an important protection against solar ultraviolet radiation, and their use as a refrigerant worldwide was curtailed in the [[Montreal Protocol]] of 1987.