definition of District cooling, District Cooling:Facility and Heating Load

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1. In my simulation, I use Ideal Air load for the three thermal zones. Ideal Air Loads means each zone has their own equipment. But district heating means centralized system. These two things seem contradictory to each other. In this case, why is there still a report for district cooling? There is no centralized system?
2. what is the difference between heating loads and district heating?

I think EnergyPlus models Ideal Air Loads somewhat similar to District Heating/Cooling, although I am not 100% sure and comments from experienced users are welcome.

Yes, an Ideal Air Loads means each zone has its own equipment and its 100% efficient. It is modeled as an ideal VAV terminal unit and it eliminates any inefficiencies at the plant level or in the distribution system. Even Dist. Heating/Cooling assumes heating/cooling is provided from a centralized source and it eliminates plant inefficiencies

Thanks for replying me! I still have one question:).. What is the difference between district heating in "Austin Energy Enduse Timeseries CSVExport" and Heating Loads in "Zone Load Summary"? Because in my case, the two results (the number) have huge difference :(.( the unit of heating loads in "zone load summary" is kBtu/ft2 per Run Period. To get the total energy consumption, I use this number multiple the house area. The unit of district heating in "Austin Energy Enduse Timeseries CSVExport" is kBtu. But the result is presented by every hour. So I add all the number in the excel file)