Energy management of heating, ventilating and air conditioning (HVAC) systems is one of the main factors in environmentally building design. In Kuwait, Air conditioning equipments consume about seventy percents of the energy consumption in summer. This paper proposes optimization approach for energy management in HVAC systems. It investigates experimentally and theoretically the effect of some operating factors as condensing pressure, ambient temperature, solar heat gain, building specifications..etc, on the HVAC energy consumption. The cooling load consumption during the summer in the hot and humid areas of Kuwait is estimated along with the actual electrical energy consumption.