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In an electric vehicle, a maximum cruising range is adversely affected by electric power consumption of auxiliary electric components for heating and cooling. Therefore, it is important for the air-conditioning to consume energy as efficiently as possible. This study describes how a proposed Occupied-Zone(OZ) HVAC system has attained a significant increase in the cruising range of an electric vehicle by air-conditioning occupied seats only. The idea of OZ HVAC is to confine air-conditioning to occupied-zones only. The OZ HVAC has an option of selectively air-conditioning three zones corresponding to driver, passenger and rear seating positions, while a conventional HVAC system air-conditions a whole cabin regardless of occupancy in each zone, which results in more power consumption compared to the proposed idea.