Abstract: A heat pump method, in which a working medium is vaporized at a lower temperature level using a heat source and subsequently compressed and liquefied at an upper temperature level using a heat sink, wherein: after being vaporized and before being compressed, the working medium is superheated; a temperature increase caused by the compression is restricted by means of injection into the compression; and after being compressed and before being liquefied, the working medium is saturated at the upper temperature level. The present invention also relates to a corresponding heat pump arrangement.