electric system

- I need you to choose a system: *Electric System: - Ducting System - Lighting System *HVAC System: - Cooling system -Chillers The Content: -what do you know about the system - the function of the system and how it's used - example in real life: - types in the market - and cost - Rating of system and operation - where it's best to be used Note: I'm from US try to find in US market. Also, you can only use one website as Source