Saudi Arabia has been suffering from high temperatures produced by the country’s envi- ronment, which has resulted in increased electricity demand, notably in air conditioning, due to the country’s dry desert nature, thereby affecting the residents’ daily lives. This research aims to apply integrated building automation systems to control lighting, cooling, heating and ventilation in the Kingdom of Saudi Arabia and provide remote control and real-time monitor- ing of building energy consumption. This study suggests a solution in which sensors evaluate indoor air and thermal comfort, such as temperature, humidity, PMV, and PPD, while another sensor detects human presence. Based on this, the AC will switch on or off . The smartphone app will then alert the residents of the house.