A closed loop cooling system for a junction box in a vehicle includes a junction box housing and a storage compartment for a vehicle. A cool air duct interior volume of a cool air duct and a warm air duct interior volume of a warm air duct are each in fluidic communication with a housing interior volume of the junction box housing and a compartment interior volume of the storage compartment to form a closed loop cooling system. The cool air duct interior volume is sized to convey cool air from a cool air outlet of the storage compartment to a cool air inlet of the junction box housing, and the warm air duct interior volume is sized to convey warm air, which is warmer than the cool air, from a warm air outlet of the junction box housing to a warm air inlet of the storage compartment.