Saudi Arabia is characterized with high temperature, humidity, and dust storms. The air conditioning systems are an essential component in daily life. 60% of the energy consumed in the residential area is used by air conditioning systems. The aim of this paper is to build a residential thermal HVAC model, which could predict the amount of energy consumption required to get the comfort level using Matlab/Simulink. In this model the different physical properties of the building, weather, and heating gains are taken to account. The results of energy consumption obtained from Matlab/Simulink model are based on using the actual hourly outdoor temperature for a selected day of 2012 compared to the average outdoor temperature of the same selected day. The results of energy consumption for the actual and average temperatures are almost identical. For this reason, the results of total energy consumption are presented in this paper for every day of the annual year of 2012 based on the average hot and warm outdoor temperatures (7 1/2 months), and cool and cold temperatures (4 1/2 moths).
