The invention relates to a thermal installation for a hybrid vehicle comprising a heat engine (1) associated with an electric motor (20). A first branch of a refrigerant circuit (6) comprises an auxiliary condenser (6d) of refrigerant in heat exchange selectively with, on the one hand, a first loop of heat transfer fluid in heat exchange with a first circuit (19) of fluid coolant downstream of the low temperature radiator (19a) or in heat exchange with the first fluidic loop (2b, 2c) of the second coolant circuit downstream of the high temperature radiator (2d), or, on the other hand, an auxiliary loop of heat transfer fluid from the second fluid loop (5) of the second heat transfer fluid circuit bypassing a portion of the second fluid loop (5) upstream of the air heater (5a), the auxiliary condenser (6d) of coolant being arranged in the refrigerant circuit (6) in series and upstream of the condenser (6c) of refrigerant in heat exchange with the outside air.
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