The 2020 ASHRAE Handbook—HVAC Systems and Equipment discussesvarious systems and the equipment (components or assemblies) that comprisethem, and describes features and differences. This information helps systemdesigners and operators in selecting and using equipment. Major sections discussair-conditioning and heating systems; equipment and components for air handling,heating, cooling, and general application; packaged, unitary, and split-system equipment;and general systems.