The purpose of the study is to investigate the potential energy saving of integrated M-Cycle evaporative cooling with HVAC. The model consists of three sub-systems which are thermal model of the typical house in Saudi Arabia, HVAC, and M-Cycle evaporative cooling. A thermal model of the typical house is performed to estimate the cooling load and then an integration between these sub-systems were built in MATLAB Simulink where the dynamic behavior of the whole system is examined. The house was simulated based on the actual hourly outdoor temperature and the physical properties of the house to estimate the cooling loads. To facilitate the simulation, the average hourly temperature is used. The results of the simulation show that energy consumption during peak hours can be reduced by up to 6%. It was found that the control system has a tremendous impact on controlling house temperature and cooling load. The impact of two different control strategies is investigated and their influence on house temperature and cooling loads are determined. It was found that PID control has advantage over On/Off control, in which the temperature in the space environment is kept uniform, and energy consumption is reduced by 20%.