Commercial buildings typically utilize different types of HVAC systems based on their size, layout, and specific requirements. Here are some common types of HVAC systems used in commercial buildings: Rooftop Units (RTUs): RTUs are self-contained HVAC systems placed on the roof. They contain all the necessary components, including the air conditioning unit, heating unit, and ventilation system. RTUs are popular for their space-saving design and ease of maintenance. Variable Air Volume (VAV) Systems: VAV systems allow for individual control of airflow and temperature in different zones of a building. They use variable speed fans and dampers to regulate airflow and achieve energy efficiency by adjusting the amount of conditioned air based on demand. Chilled Water Systems: Chilled water systems use a central chiller to cool water, which is then circulated to air handling units or fan coil units throughout the building to provide cooling. These systems are commonly found in larger commercial buildings with high cooling loads. Heat Pump Systems: Heat pump systems can provide both heating and cooling by transferring heat between indoor and outdoor environments. They are efficient in moderate climates and can be used in various commercial building types. Dedicated Outdoor Air Systems (DOAS): DOAS systems focus on providing ventilation by conditioning outdoor air separately from the main HVAC system. They ensure a supply of fresh air while improving energy efficiency. These are just a few examples of HVAC systems used in commercial buildings. The selection depends on factors such as building size, occupancy, climate, energy efficiency goals, and budget constraints. Consulting with HVAC professionals or engineers is recommended to determine the most suitable system for a specific commercial building.