The present embodiments relate to an HVAC system which is externally mounted on a vertical surface of an RV, truck or bus. The desire is to eliminate, or at least substantially reduce, a potential leakage path wherein water may sit on an upper surface of a vehicle and due to seal degradation over long periods of time, may find a pathway in through the roof of the vehicle and to an interior thereof. By positioning the HVAC on a vertical surface, gravity works to move water downward and away from the HVAC system rather than allowing it to stagnate in an area around potential apertures through the outer skin or outer surface of the vehicle.

The present embodiments relate to an HVAC system which is externally mounted on a vertical surface of an RV, truck or bus. The desire is to eliminate, or at least substantially reduce, a potential leakage path wherein water may sit on an upper surface of a vehicle and due to seal degradation over long periods of time, may find a pathway in through the roof of the vehicle and to an interior thereof. By positioning the HVAC on a vertical surface, gravity works to move water downward and away from the HVAC system rather than allowing it to stagnate in an area around potential apertures through the outer skin or outer surface of the vehicle.

A vehicular air-conditioning device for cooling and heating includes a refrigerant circulation passage formed in a housing, an air circulation passage located in the housing and configured to perform heat exchange with the refrigerant circulation passage, and a controller configured to receive an interior temperature from an interior temperature sensor of a vehicle and to operate a first switching door and a second switching door. The air circulation passage includes a blower, a first flow path formed between a first duct part located at one end of the housing and the blower, the first switching door configured to selectively open the first duct part, a second flow path formed between a second duct part located at the other end of the housing and the blower, and the second switching door configured to selectively open the second duct part.