HVAC system architecture is the design of the components and systems that make up a heating, ventilation, and air conditioning system. It includes the layout of the ductwork, the size and type of equipment, the location of the thermostat, and the control systems used to regulate the system. The architecture of an HVAC system is designed to provide efficient and effective heating and cooling for a given space. It is important to consider the size of the space, the climate, and the desired comfort level when designing an HVAC system. The architecture should also be designed to ensure that the system is energy efficient and cost effective.