Optimized heat pump apparatus for regulating motor vehicle temperature

Motor vehicle temperature regulation apparatus comprising:

• a first heat pump comprising a main compression circuit for refrigerant fluid taking heat from a cold source to transfer it to a hot source;
• the cold source comprising a first heat exchanger for exchanging heat between the refrigerant fluid and a coolant liquid, thereby thermally coupling the main refrigerant circuit to a first secondary coolant circuit;
• the hot source comprising a second heat exchanger thermally coupling the main refrigerant circuit to a second secondary coolant circuit,
• wherein the first secondary circuit includes first selective connection means for selectively connecting the first secondary circuit to the upstream and downstream ends of a branch of a coolant liquid circuit, wherein the branch is used to cool a heat engine of the vehicle, the branch being designated as a heater branch, the second secondary circuit including second selective connection means for connection to a “hot” heat exchanger, and the first selective connection means comprise a valve means comprising:
• a first port connected to the downstream end of the heater branch;
• a second port connected to an inlet of the first heat exchanger;
• and
• a third port connected to an inlet of the hot heat exchanger.