Abstract: A reversible heating and cooling device for temperature control of a passenger compartment of a vehicle includes a housing, which is mountable within an aperture that is in a dash of a vehicle. A heat pump is attached within the housing. A selector is attached to the housing enables to selectively actuate a battery to power the heat pump in a first mode and a second mode. In the first mode, heat is pumped into the engine compartment, whereas, in the second mode, heat is pumped into the passenger compartment. The heat pump can be used to selectively cool and heat the passenger compartment.