Abstract: A system for overall control of heat for a passenger compartment and for electrical units in a motor vehicle that is completely or partially propelled by an electric engine powered by a battery, including a heat-control fluid circuit coupled to a heating device and/or to a cooling device enabling the fluid to store calories or frigories when the system is plugged into an electrical network outside of the vehicle. The fluid circuit is capable of releasing calories and/or frigories to the air of the passenger compartment, in an alternating manner, either through a heat exchanger between the circuit and the air of the passenger compartment, or using a climate circuit forming a heat pump and/or an air-conditioning system.