What type of HVAC system is characterized by a having a split supply air stream, with one for cold air and the other for hot air?

Correct Answer: Option A — A dual duct system

Dual duct systems are defined by their split supply air streams, which provide both hot and cold air to terminal mixing boxes. This design allows the system to satisfy varying heating and cooling loads simultaneously across different zones by adjusting the ratio of hot to cold air at each location.