This HVAC package plan depicts everything involved in a central air system in a single unit located outside the home. Homes with limited indoor space for these systems or without underground spaces will use a packaged unit. The packaged HVAC system contains all of the system's components in a single metal cabinet. The evaporator coil, condenser, and compressor are all housed together to save space inside. The outdoor cabinet is connected to all of the rooms in the house via custom-made ductwork. Even though the cabinet is outside, the actual functions of a packaged central air system are controlled inside.