a housing defining an interior space and configured for selective partial insertion by a first end into an aperture in a dash of a vehicle, such that the housing is removably mounted to the dash with the first end and a second end of the housing protruding into an engine compartment and a passenger compartment of the vehicle, respectively;

a battery attached to the housing and positioned in the interior space;

a heat pump attached to the housing, positioned in the interior space, and operationally engaged to the battery, the heat pump comprising:

a wall attached to the housing and defining a pair of compartments within the interior space, such that each compartment contains a respective heat exchanger of the pair of heat exchangers and a respective fan of the pair of fans;

a plurality of slots positioned in the housing defining a pair of intake vents and a pair of outlet vents, such that each compartment of the pair of compartments has an intake vent and an outlet vent, such that each fan is positioned for motivating air through a respective compartment and a respective heat exchanger positioned in the respective compartment; and

a selector attached to the housing and operationally engaged to the battery and the heat pump, such that the selector is enabled for selectively actuating the battery for powering the heat pump in a first mode and a second mode, wherein heat is pumped into the engine compartment and into the passenger compartment, respectively, wherein the heat pump is configured for selectively cooling and heating the passenger compartment.