Physics Hypertextbook
The Physics Hypertextbook: Refrigerators
This resource provides a detailed discussion about how refrigerators work. Also includes a history of the invention of refrigerators, and the physics behind how they work.
Other
Especial Gas Inc.: Chlorofluorocarbons Cfc's
Especial Gas Inc. provides a good description of what CFCs are and the dates that countries started to ban them. Explains where the name freon came from.
Other
Advanced Thermoelectric: Fundamental Thermoelectrics
Discusses the scientific principles (the Peltier effect) and the reliability and operation of thermoelectric modules. Includes a link to several other pages, one of which contains an animation of their operation.