Abstract
Air Conditioning is just what the name suggests, air that have been conditioned to meet demands of the occupants of home, office, factory or any internal space. Air conditioning provides and maintains internal air conditions at a set temperature, regardless of the time of the year, the season or the country of residence. In this report, it will be focus on centralized air conditioning system. Central (ducted) air conditioning offers whole-house or large-commercial-space cooling, and often offers moderate multi-zone temperature control capability by the addition of air-louver-control box. Besides that, it will show the maintenance work om air conditioning system especially at the big structure and a big air conditioning system like centralized air conditioning system.