HVAC system condition of indoor environment is very important to create and maintain desirable temperature, humidity, ventilation and air purity. Also, it accounts a high figure in the total energy consumption. So, it is essential to conduct energy assessment for the HVAC systems in order to make sure it is preforming perfect with the minimum energy required. In order to maximize the HVAC system efficiency, there are different factors to be considered such as energy consumption, energy cost, O&M style and cost and equipment lifespan. Our HVAC assessment helps in understanding the HVAC system and provides cost-effective measures to improve its performance.