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  • In Japan, thanks to strong legislation favouring effi-

    ciency improvements, heat pumps are now available with a coefficient of

    performance of 4.9.
    • dave45
      Dave45 on 2009-05-13
      Am I being cynical in guessing that these figures quoted for COP are peak or best figures? how does the COP vary with external air temperatures that we are likely to see in the UK?... I imagine it is easy and efficient to extract heat from warm air, but what matters is the range -5 to +15C... more COP data please. Otherwise its like car MPG figures.

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