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<p>a <a href="page.php?w=heat_pump">heat pump</a> can achieve around 150% - 600% efficiency for heating, or COP 1.5 - 6.0 <a href="page.php?w=Coefficient_of_performance">Coefficient of performance</a>, because it uses electric power only for transferring existing thermal energy. The heat pump uses an <a href="page.php?w=electric_motor">electric motor</a> to drive a reversed <a href="page.php?w=refrigeration_cycle">refrigeration cycle</a>, that draws heat energy from an external source such as the ground or outside air (or the interior of a refrigerator)</p><p>
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