By the second law of thermodynamics work has to be done to transfer heat for a low temperature region to a high temperature region. This happens in a refrigerator. The COP is the ratio of heat transferred to work done. Heat pumps are possible(at least in text books) which tranfer heat from low temperature ambience to high temperature enclosures. If they are in practical use what is their COP|||it is simply the efficiency of the refrigerator or the heat pump...we do not use the efficiency because efficiency is work output over work input, but it is reverse in a heat pump so here we use the coefficient of performance...the higher the COP the better...|||#Please read the contents in the following link:
http://en.wikipedia.org/wiki/Heat_pump
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